What is TAC Type Allocation Code

The Type Allocation Code (TAC) is an essential part of the International Mobile Equipment Identity (IMEI) system. Let’s dive into the technical details:

1. What is TAC?
   • The TAC is the initial eight-digit portion of the 15-digit IMEI (International Mobile Equipment Identity) and 16-digit IMEISV (IMEI Software Version) codes.
   • It uniquely identifies wireless devices, such as mobile phones, tablets, and other communication devices.
2. Purpose of TAC:
   • The TAC identifies a specific model (and often its revision) of a wireless telephone.
   • It’s used for devices operating on various networks, including GSM, UMTS, LTE, 5G NR, iDEN, and Iridium.
3. Structure of TAC:
   • The first two digits represent the Reporting Body Identifier (RBI). This indicates the GSMA-approved group that allocated the TAC.
   • Prior to January 1, 2003, the IMEI started with a six-digit Type Approval Code (TAC) followed by a two-digit Final Assembly Code (FAC).
   • The TAC indicated approval by a national GSM body, while the FAC identified the company that assembled the device (which might differ from the brand name).
4. Transition to Self-Regulation:
   • After 2003, many GSM member nations shifted away from national approvals.
   • Manufacturers now request an eight-digit TAC directly from the international GSM standards body.
   • Both old and new TACs uniquely identify a phone model, accounting for revisions and manufacturing locations.
5. Example TACs:
   • Here are some TAC examples:
     • Apple iPhone 4: 01233600
     • Samsung Galaxy Tab E: 35951406