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Tracking numbers are numbers assigned to packages when they are shipped. Tracking numbers are useful for knowing the location of time sensitive deliveries. It is a unique ID number or code assigned to a package or parcel. The tracking number is typically printed on the shipping label as a bar code that can be scanned by anyone with a bar code reader or smartphone.

In the United States, some of the carriers using tracking numbers include UPS,[1] FedEx,[2] and the United States Postal Service.[3] Most postal services use the S10 (UPU standard) (format AA 00000000 9 BB) for international mailings, including the United States Postal Service[4] and most European postal services.

Formats

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Tracking numbers consist of letters and numbers typically between 8 and 40 characters long sometimes with spaces or hyphens between groupings of characters. When shown on a receipt after shipping a package the tracking number is usually close to the barcode.

FedEx Ground and Express tracking numbers are 12 digits (with the ability to expand to 14 characters in the future), while overall barcode length is 34 digits.[5]

A UPS tracking number, for domestic packages within the United States, will usually start with "1Z" followed by a 6 character shipper number (numbers and letters), a 2 digit service level indicator, and finally 8 digits identifying the package (the last digit being a check digit), for a total of 18 characters.

DHL Express supports the carrier-independent ISO standard 15459-1[6] for the identification of single packages. Such identifiers consist of uppercase characters and numerals, and they can be up to 35 digits long. Companies that already use this standard do not require an additional identifier to track their pieces when shipping with DHL Express. In addition, DHL Express uses numeric identifiers of exactly ten digits to track transport orders (i.e. an order to transport a shipment consisting of one or more pieces from A to B). Customers can use both codes for tracking purposes.

See also

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References

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Revisions and contributorsEdit on WikipediaRead on Wikipedia

Tracking number

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A tracking number is a unique alphanumeric identifier assigned by shipping carriers or postal services to each package, shipment, or mail item, allowing senders and recipients to monitor its location, status, and estimated delivery progress in real time through online portals, mobile apps, or tools. These numbers are automatically generated upon label creation and printed as scannable barcodes on shipping , facilitating automated scanning at sorting facilities, transportation hubs, and delivery points to update tracking information. Tracking numbers vary in format depending on the carrier and service type, ensuring compatibility with their internal systems while providing essential data like origin, destination, and service level. For (USPS) domestic shipments, common formats include 22-digit numbers starting with prefixes such as 9400 for USPS Tracking, 9205 for Priority Mail, or 9274 for Parcel Select, all consisting of numeric digits separated by spaces for readability. In contrast, (UPS) typically uses 18-character codes beginning with "1Z" followed by a combination of letters and numbers for its services, including express and ground, which are designed for precise tracing within the UPS network. Federal Express (FedEx) employs 12- to 15-digit numeric tracking numbers for most domestic and international packages, often prefixed with service indicators like "96" for international priority, enabling seamless integration with their global tracking infrastructure. Internationally, the Universal Postal Union (UPU) S10 standard governs tracking identifiers for postal items exchanged between member countries, mandating a 13-character format: two uppercase letters indicating the service type (e.g., "EE" for EMS priority), followed by nine digits for the serial number and , and ending with two letters denoting the country of origin per codes (e.g., "US" for the ). This standardization, adopted by over 190 postal operators, promotes for cross-border tracking, though private carriers like UPS and may use proprietary formats alongside UPU-compliant ones for hybrid shipments. Overall, tracking numbers enhance visibility, reduce delivery uncertainties, and support features like delivery notifications, rerouting requests, and proof-of-delivery documentation across global logistics networks.

Overview

Definition

A tracking number is a unique alphanumeric identifier assigned by shipping carriers to individual shipments, parcels, or mail items, enabling real-time monitoring of their location and status throughout the transportation process. This identifier facilitates communication between postal operators, customs authorities, and customers, ensuring traceability from origin to destination. Unlike a , which uniquely identifies a manufactured product for purposes such as , warranties, or recalls, a tracking number is specifically tied to the journey of the item rather than the item itself. Similarly, while often encoded within a for scanning, the tracking number is the underlying data string, distinct from the as its visual or machine-readable format on labels. Tracking numbers typically range from 10 to 34 characters in length, combining letters and digits to encode essential information. A common general structure includes a prefix denoting the carrier or service type (e.g., two letters indicating product category like "EA" for express mail), followed by a sequential serial number for uniqueness, and a check digit for error validation. For instance, in international postal standards, this may follow a 13-character format such as AA999999999CC, where the prefix specifies the service, the middle digits provide the sequence, and the suffix indicates the origin country code.

Purpose and Benefits

Tracking numbers serve as unique identifiers for shipments, enabling real-time visibility into package status, current location, and estimated delivery times through online portals or mobile apps provided by carriers. This functionality allows both senders and recipients to monitor progress without direct contact, fostering accountability throughout the transit process. For senders, tracking numbers provide proof of dispatch upon assignment at the point of origin, confirming that the package has entered the network and serving as a record for or . Additionally, they facilitate automated notifications, such as or alerts for key milestones like departure or arrival, which streamline communication and reduce manual follow-ups. Recipients benefit from this transparency, gaining insights that alleviate uncertainty and anxiety about delivery timelines, ultimately enhancing satisfaction and encouraging repeat business. Operationally, tracking numbers contribute to efficiencies by minimizing lost packages through prompt identification of anomalies in transit, allowing carriers to intervene swiftly and recover items. They also support route optimization by providing data on shipment locations, enabling dynamic adjustments to avoid delays and improve overall logistics flow. Furthermore, they aid by empowering agents to resolve inquiries quickly with specific status details, reducing call volumes and resolution times. In the broader economy, tracking numbers bolster growth by instilling confidence in online transactions; transparent visibility builds trust between retailers and consumers, leading to higher conversion rates and loyalty in a sector where delivery reliability is a key differentiator. This trust factor has been instrumental in expanding global , as reliable tracking mitigates perceived risks associated with remote purchases.

History

Early Developments

The concept of tracking numbers emerged in the mid-20th century as postal services implemented mechanized sorting to manage surging volumes amid post-World War II growth. In the United States, the U.S. Post Office Department introduced the Zone Improvement Plan (ZIP) Code in 1963, assigning a five-digit numeric identifier to each delivery point to enable automated sorting machines. These early numeric systems laid the groundwork for item-specific identification, though initially focused on letters rather than parcels. The expansion of air mail and express courier services accelerated the adoption of basic tracking in the 1970s. Federal Express, established in 1971 to revolutionize , developed numeric tracking codes for packages as part of its hub-and-spoke model, launching the (Customers, Operations, and Service Master Operating System) in 1979 to record movements using unique identifiers entered via early handheld devices. This marked one of the first structured uses of tracking numbers in private shipping, emphasizing reliability for time-sensitive freight. Similarly, (UPS), founded in 1907, began implementing computerized systems in the 1980s to enhance visibility in its growing network. Despite these advances, early tracking systems suffered significant limitations, including manual logging by employees, dependence on paper manifests for recording package details, and the absence of real-time updates, which often delayed status information to days or weeks via phone or . A pivotal advancement occurred in the with the integration of , which linked tracking numbers to machine-readable labels for more efficient processing. The U.S. rolled out the Postal Numeric Encoding Technique (POSTNET) in the early , encoding ZIP Codes and rudimentary parcel identifiers into vertical bars for optical scanning during sorting, thereby reducing errors and enabling preliminary end-to-end visibility.

Standardization Efforts

In the 1990s, the Universal Postal Union (UPU) initiated collaborative efforts to develop interoperable identifiers for postal items, aiming to unify tracking across international networks and address the fragmentation of national systems. This push was facilitated through the establishment of technical standards bodies, with early work focusing on identifiers for postal receptacles and containers to enable consistent data exchange among member operators. For instance, the UPU approved the initial version of its S9 standard for postal receptacle identifiers in 1996, representing a foundational step toward global compatibility in operational messaging. Building on this momentum, the UPU advanced standards for individual item tracking, with the S10 standard—first approved in 1996—receiving significant updates in the , including version 7 in , which defined a 13-character alphanumeric identifier for international postal items to support end-to-end visibility. Concurrently, the development of Electronic Advance Data (EAD) protocols emerged as a key initiative for integrating customs clearance with tracking, allowing origin operators to transmit shipment details electronically prior to border crossing for enhanced security and efficiency. These efforts were supported by joint guidelines from the UPU and the (WCO), which standardized EAD messaging to facilitate seamless data sharing between postal operators and customs authorities. Parallel to UPU initiatives, industry groups such as the (IATA) drove for tracking, evolving from early protocols in the to comprehensive (EDI) systems in the 2000s. IATA's Cargo-IMP messaging standards, refined during this period, enabled interoperable tracking of air shipments across carriers, reducing errors and improving coordination. The post-2000 e-commerce boom further accelerated these efforts, as global parcel volumes surged—growing over 20-fold in some regions—prompting widespread adoption of digital protocols to handle increased demand for real-time and cross-border integration. UPU analyses highlight how expansion created imperatives for posts to implement advanced tracking to capture new revenue streams and meet customer expectations for reliability.

Formats and Identification

Carrier-Specific Formats

Major shipping carriers employ proprietary formats for tracking numbers to facilitate unique identification of packages within their systems. These formats vary by carrier, service type, and whether the shipment is domestic or international, often incorporating prefixes, digit lengths, and alphanumeric combinations to encode essential details like origin, service level, and sequence. United Parcel Service (UPS) tracking numbers for standard ground and air shipments typically consist of 18 characters beginning with "1Z", followed by a 6-character shipper number, a service level indicator, and an 8-digit package identifier. An example is 1Z12345E0205271687. For international shipments, UPS may use similar 1Z formats or alternative numeric structures like 12-digit numbers without the prefix, depending on the service. Less-than-truckload (LTL) shipments often feature tracking numbers starting with "T" followed by 10 digits. FedEx tracking numbers differ by service: Express shipments use 12 consecutive digits, such as 123456789012, while Ground services employ 15 digits, frequently prefixed to indicate the type (e.g., starting with 61 for some domestic Ground packages). International Express shipments maintain the 12-digit format but may include variations up to 22 digits for certain integrations like SmartPost. The (USPS) utilizes 22-digit tracking numbers for services like Priority Mail, structured with a service-indicating prefix followed by segments for and identification, as in 9205 5000 0000 0000 0000 00. Priority Mail International uses the 13-character UPU S10 format, such as CP 123 456 789 US, to denote global . Domestic First-Class Mail may use shorter 20-digit formats without spaces. DHL tracking numbers for Express services are generally 10 digits, though international shipments often feature 10-11 alphanumeric characters starting with "JJD" to signify global forwarding, exemplified by JJD0012345678. Domestic or shipments within regions like may use 10-digit numeric codes prefixed with "3S" or "JVGL", while U.S.-origin international tracks with "GM" followed by 15-21 digits.

Structure and Decoding

Tracking numbers generally follow a structured format comprising three main components: a prefix that encodes the carrier or service type, a body that provides a unique sequential identifier for the item, and a suffix serving as a to detect transcription errors. This architecture ensures uniqueness and verifiability across shipments. For instance, in the Universal Postal Union (UPU) S10 standard used for international mail, the format is a 13-character string with positions 1-2 as alphabetic service indicators (e.g., "RR" for ), positions 3-10 as an eight-digit , position 11 as a numeric , and positions 12-13 as the two-letter of the issuing postal operator. Check digits are computed using algorithms such as modulo-10 or weighted sums to validate the integrity of the number. In the UPU S10 format, the 11th character (a digit) is a check digit calculated as a weighted modulo-11 sum of the serial number digits in positions 3-10 using weights 8, 6, 4, 2, 3, 5, 9, 7 (sum modulo 11, then 11 minus remainder with adjustments: 10→0, 11→5). For carrier-specific examples like UPS, the check digit (the 18th character in a "1Z"-prefixed number) uses a position-based weighted modulo-10 algorithm on the preceding 16 characters (after "1Z"), treating odd and even positions differently for numeric and alphanumeric values, with the final digit being 10 minus (total modulo 10) or 0 if the modulo is 0. Decoding tracking numbers often begins with analyzing the prefix to identify the origin service or country. For example, USPS tracking numbers starting with "9270" denote Priority Mail Express International; these prefixes allow quick determination of the service class without accessing tracking systems. Similarly, in UPU S10 codes, the initial two letters reveal the mail category, such as "EA" for parcels or "QO" for parcels, facilitating origin tracing across international postal networks. Various tools enable decoding and validation of tracking numbers by their structure. Online validators, such as those integrated into carrier websites or third-party platforms like Ship24, input the number to check format compliance and prefix meaning without querying full shipment status. , including USPS Web Tools for domestic formats and UPS Tracking API for "1Z" numbers, provide programmatic to extract components like service codes and verify check digits programmatically. These resources support error detection and carrier identification efficiently.

Tracking Process

Assignment and Integration

Tracking numbers are generated automatically by carrier software systems during the initial stages of shipment creation, employing algorithms designed to ensure global uniqueness across millions of daily packages. These algorithms use structured formats that include service prefixes, sequential identifiers—advancing with each new shipment—and check digits for validation. For instance, major carriers like UPS and utilize proprietary systems that produce alphanumeric codes instantly upon label generation, enabling immediate trackability without manual intervention. The assignment occurs precisely at the moment of shipment initiation, most commonly when the shipping label is created through online portals, APIs, or integrated software. This timing aligns with pickup scheduling or label printing, allowing senders to provide tracking details to recipients right after processing the order, often within seconds in automated environments. In practice, services such as USPS generate these numbers as part of their Electronic Shipping Services, embedding them directly into digital labels for seamless workflow integration. Integration of the tracking number into shipping workflows happens at multiple key points to facilitate efficient handling and monitoring. It is prominently printed on shipping labels, encoded as scannable barcodes (such as or QR codes) alongside sender and recipient details, ensuring handlers can capture data at every . The number is also linked to shipping manifests—consolidated documents listing all packages in a pickup batch—which carriers scan to verify and load shipments, streamlining operations for high-volume shippers. Furthermore, through integrations with e-commerce platforms like or , tracking numbers are automatically synced to order management systems, enabling real-time notifications and order fulfillment updates without manual data entry. For multi-leg shipments that involve handoffs between carriers, such as domestic-to-international transfers or last-mile delivery by partner logistics companies, the original tracking number is typically retained and shared via agreements or data exchanges between partners. This transfer maintains a single point of reference for end-to-end visibility, with the receiving carrier updating the status under the same identifier rather than issuing a new one, though supplemental numbers may be used internally for specific legs. It is standard practice to use existing barcodes and tracking numbers from partner logistics companies for last-mile delivery, leveraging their uniqueness, which is intended to cover the full supply chain, and resulting in cost savings by avoiding the generation of new identifiers. In this process, the tracking number serves as a unique ID in shared databases, where it can be scanned using mobile apps or handheld scanners by the last-mile provider to update statuses and ensure continuous visibility throughout the delivery chain.

Status Updates and Visibility

Once a tracking number is assigned to a package, status updates are generated throughout its journey as it passes through various checkpoints in the network. These updates are primarily triggered by automated scans of the attached to the package, with RFID tags used in some advanced or emerging systems (e.g., UPS pilots as of 2024). At sorting facilities, handheld or fixed scanners read the as items move along conveyor belts, capturing data on arrival, processing, and departure. Similar scans occur during loading onto trucks or at delivery points, where drivers or recipients use mobile devices to confirm handoffs, thereby updating the package's and status in real-time or near-real-time systems. Several technologies facilitate the generation and transmission of these updates. (GPS) devices integrated into delivery vehicles provide precise location data, allowing for geofenced alerts when a package enters a specific or arrives at a facility. (EDI) standards enable seamless data exchange between carriers, shippers, and intermediaries, ensuring that scan information is automatically shared across disparate systems without manual intervention. Additionally, mobile applications developed by carriers, such as the UPS Mobile app or USPS Mobile app, deliver push notifications directly to users' devices, offering proactive alerts on milestones like "out for delivery" or exceptions. Visibility into these updates is provided through multiple channels to enhance user accessibility. Public web portals, such as those on UPS.com, USPS.com, and .com, allow customers to enter a tracking number and view a chronological history of scans, estimated delivery times, and any exceptions. and alerts offer automated notifications; for instance, USPS sends daily email previews and status updates, while UPS and support opt-in for real-time texts upon scan events. Integration with third-party platforms like 17TRACK aggregates data from over 2,400 carriers, enabling multi-carrier tracking via a single interface with customizable alerts. Despite these mechanisms, delays and gaps in visibility are common, particularly during international shipments. Handoffs between carriers or customs authorities often result in 24-48 hour lags, as data synchronization across borders relies on periodic EDI transmissions rather than instantaneous updates, leading to temporary "in transit" statuses without further details. Such gaps can extend during peak seasons or processing backlogs at international sorting hubs.

Standards and Interoperability

International Postal Standards

The Universal Postal Union (UPU) S10 standard, introduced in 2009 with the adoption of the 13-character identifier format, establishes a uniform system for identifying international postal items to facilitate tracking and tracing across borders. This standard specifies a 13-character identifier consisting of a two-letter service indicator that denotes the type of mail service—such as "RR" for —followed by nine digits comprising an eight-digit serial number and one for the core item ID, and ending with two letters indicating the country of origin using codes. A , calculated using a weighted modulus 11 algorithm and represented as a digit 0-9, ensures during scanning and transmission, enabling reliable global for postal operators. Integration with customs declaration forms CN22 and CN23 enhances the visibility of tracking numbers in international shipments by linking item identifiers to declaration . The CN22 form is used for non-dutiable items or those valued under a certain threshold, while CN23 applies to dutiable goods requiring more detailed declarations; both forms can incorporate the S10 barcode, allowing authorities to associate tracking information with shipment contents electronically through systems like the UPU's Electronic Advance (EAD) exchange. This linkage, mandated in UPU regulations, supports expedited clearance and reduces delays by enabling origin postal operators to transmit S10 identifiers alongside details via the PREDES messaging standard (M41), ensuring end-to-end visibility from dispatch to delivery. The S10 standard has been widely implemented by the UPU's 192 member countries, promoting standardized tracking for cross-border mail and parcels. This adoption enables seamless end-to-end tracking, particularly through the Express Mail Service (EMS), a UPU-cooperative product that utilizes S10-compliant identifiers for priority international deliveries with features like signature confirmation. For instance, an international parcel tracking number such as "EA123456789FI" follows the S10 format, where "EA" indicates EMS priority service, the nine digits consist of an eight-digit serial number followed by a check digit, and "FI" is the ISO 3166-1 alpha-2 code for Finland as the originating country. This framework ensures consistent handling and monitoring worldwide, minimizing lost items and improving service reliability.

Industry-Wide Protocols

In the logistics industry, the standards play a pivotal role in enabling standardized tracking across supply chains, particularly through the (SSCC). The SSCC is an 18-digit alphanumeric identifier designed to uniquely label logistic units such as pallets, containers, or groups of trade items, facilitating seamless identification and movement throughout the distribution process. Encoded in barcodes with the application identifier (00), the SSCC begins with this prefix followed by an extension digit, a company prefix, a serial reference, and a , ensuring global uniqueness and among trading partners without reliance on postal systems. To support real-time data sharing between carriers, industry protocols increasingly incorporate integrations, including RESTful services and (EDI) standards, which allow for the exchange of tracking information during handoffs or multi-carrier journeys. For instance, platforms aggregating services from carriers like UPS and utilize these protocols to query and update shipment statuses, enabling automated notifications and visibility across networks. EDI transaction sets, such as the 214 Shipment Status Message, are commonly employed to transmit tracking updates between providers, reducing manual interventions and errors in inter-carrier transfers. In the sector, Cargo iQ serves as a key industry standard for air freight tracking, developed by the (IATA) to enhance performance measurement and data exchange. This initiative standardizes the handling of () numbers—11-digit identifiers for shipments—by linking them to detailed tracking IDs and milestones, allowing stakeholders to monitor progress from origin to destination with consistent messaging protocols. Cargo iQ's framework promotes among airlines, ground handlers, and freight forwarders, focusing on key performance indicators like on-time departures and updates to improve overall efficiency. Post-2020, blockchain technology has seen emerging pilots for tamper-proof tracking in supply chains, leveraging systems to provide immutable records of shipment movements and . Initiatives such as IBM's Food Trust platform and various enterprise trials have demonstrated blockchain's ability to enable end-to-end visibility, where tracking numbers are hashed into blocks for verification without altering . These pilots, often integrated with IoT sensors, address challenges in multi-party by ensuring secure, transparent while minimizing disputes over custody and status.

Security and Challenges

Privacy and Data Protection

Tracking numbers in package delivery systems are linked to various personal data points, including recipient names, addresses, delivery times, and geolocation details such as GPS coordinates or / from scans. These elements enable real-time visibility into shipment progress but also collect information that can reveal sensitive patterns, such as frequent deliveries to specific locations indicating home or work routines. For instance, aggregated tracking data from multiple packages may disclose an individual's regular movement or habits without explicit . Regulatory frameworks address these privacy risks by imposing strict requirements on data handling. In the , the General Data Protection Regulation (GDPR) mandates explicit for processing tied to tracking, such as addresses and locations, treating them as identifiable that requires lawful basis for collection and storage. Carriers must ensure data minimization, secure transfers (e.g., via Binding Corporate Rules for intra-company sharing), and user rights to access or erase tracking-related data. In the United States, the (CCPA) grants residents rights to of the sale or sharing of , including tracking details like delivery addresses, and requires businesses to disclose data practices in notices. Shipping companies must honor these opt-outs and provide mechanisms like Global Privacy Control signals to limit data dissemination. Major carriers implement policies to mitigate these concerns through anonymization and limited retention. For example, UPS anonymizes personal information in data analyses and retains tracking data only as long as necessary for service delivery or legal obligations, typically purging identifiable details post-purpose. similarly deletes or anonymizes data after retention periods, which vary by but often extend 3 to 7 years for customs-related records while shorter for routine tracking. USPS limits standard tracking retention to 120 days for non-premium services, with options to extend via paid services like USPS Tracking Plus up to 10 years, and avoids storing recipient-identifying data beyond federal requirements unless requested. These practices aim to balance operational needs with , though public tracking portals can still expose details if numbers are shared. Users face potential harms from openly sharing tracking numbers, as public interfaces may display delivery addresses and timestamps, enabling unauthorized parties to monitor locations and infer personal routines, which could facilitate stalking or harassment. To counter this, experts recommend verifying trackers on official carrier sites and avoiding public disclosure of numbers.

Fraud and Misuse Prevention

Tracking numbers are frequently exploited in scams where fraudsters create websites that mimic legitimate carriers to harvest or payment details from users entering bogus or real tracking numbers. These sites often replicate the design of official portals from companies like USPS or FedEx, prompting victims to input credentials under the pretense of checking shipment status. Another prevalent tactic involves fake delivery notifications sent via text or email, claiming a package issue such as a missed delivery or required for rescheduling, often demanding immediate through unsecured links that lead to installation or data theft. Scammers exploit the anticipation of deliveries, particularly during peak seasons, to urgency victims into action without verification. For instance, messages may allege a small handling , like $0.30, to process a hold or release. To counter these threats, carriers recommend implementing two-factor authentication (2FA) for customer accounts to secure access to tracking information and prevent unauthorized queries. Users are advised to verify all notifications directly through official carrier websites or apps, avoiding any unsolicited links, and to report suspicious messages immediately. Additionally, some carriers employ advanced detection methods, such as monitoring for unusual patterns in tracking queries, though specifics on AI integration remain proprietary. Major carriers like and UPS maintain dedicated reporting systems for bogus tracking numbers and scam attempts, allowing customers to submit details such as suspicious tracking codes or unauthorized charges for investigation. directs reports to a fraud hotline (1-800-584-2681) and ([email protected]), while UPS encourages alerting them to any requests for tracking validation from unknown parties and provides a fraud reporting portal for profile changes or suspicious activity. These systems facilitate quick takedowns of fraudulent sites and collaboration with . International efforts, such as those coordinated through postal unions, include sharing alerts on emerging scams, though specific tracking-related protocols are integrated into broader fraud prevention networks. Reported losses from imposter scams, which encompass package delivery frauds involving fake tracking notifications, reached $2.7 billion in 2023 and increased to $2.95 billion in 2024, highlighting the scale of these vulnerabilities. Globally, text-based variants contribute significantly to annual fraud estimates exceeding hundreds of millions, underscoring the need for ongoing vigilance.

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  64. https://www.truecommerce.com/edi-transaction-codes/edi-214/
  65. https://www.cargoiq.org/
  66. https://www.iata.org/en/programs/cargo/cargoiq/
  67. https://www.deloitte.com/us/en/services/consulting/articles/blockchain-supply-chain-innovation.html
  68. https://link.springer.com/article/10.1007/s11301-025-00546-0
  69. https://www.ups.com/us/en/support/shipping-support/legal-terms-conditions/privacy-notice
  70. https://www.fedex.com/en-us/trust-center/privacy.html
  71. https://faq.usps.com/s/article/USPS-Tracking-The-Basics
  72. https://www.usps.com/terms-conditions/tracking-plus.htm
  73. https://about.usps.com/who/legal/privacy-policy/intelligent-mail-privacy.htm
  74. https://security.stackexchange.com/questions/197538/shipment-tracking-displaying-delivery-information-publicly-is-this-dangerous
  75. https://dl.acm.org/doi/10.1145/3366423.3380062
  76. https://consumer.ftc.gov/consumer-alerts/2023/12/fake-shipping-notification-emails-text-messages-what-you-need-know-holiday-season
  77. https://www.uspis.gov/news/scam-article/smishing-package-tracking-text-scams
  78. https://www.fcc.gov/how-identify-and-avoid-package-delivery-scams
  79. https://www.fedex.com/en-us/report-fraud.html
  80. https://www.ups.com/us/en/support/shipping-support/legal-terms-conditions/fight-fraud
  81. https://www.ftc.gov/news-events/news/press-releases/2024/02/nationwide-fraud-losses-top-10-billion-2023-ftc-steps-efforts-protect-public
  82. https://www.ftc.gov/system/files/ftc_gov/pdf/csn-annual-data-book-2024.pdf
  83. https://www.aarp.org/money/scams-fraud/fake-usps-ups-smishing-texts/
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