Section: 28.3.2.6 5GS Tracking Area Identity (TAI) FQDN
Content: The 5GS Tracking Area Identity (TAI) FQDN shall be constructed as follows: "tac-lb<TAC-low-byte>.tac-mb<TAC-middle-byte>.tac-hb<TAC-high-byte>.5gstac. 5gc.mnc<MNC>.mcc<MCC>.3gppnetwork.org" where the <TAC>, together with the <MCC> and <MNC> shall identify the 5GS Tracking Area Identity, and shall be encoded as follows: - <MNC> = 3 digits - <MCC> = 3 digits If there are only 2 significant digits in the MNC, one "0" digit shall be inserted at the left side to fill the 3 digits coding of MNC in the 5GS TAI FQDN. - The 5GS TAC is a 24-bit integer. The <TAC-high-byte> is the hexadecimal string of the most significant byte in the TAC and the <TAC-low-byte > is the hexadecimal string of the least significant byte. If there are less than 2 significant digits in <TAC-low-byte>, <TAC-middle-byte> or <TAC-high-byte >, "0" digit(s) shall be inserted at the left side to fill the 2 digits coding; As an example, the 5GS Tracking Area Identity for the 5GS TAC H'0B1A21, MCC 345 and MNC 12 is coded in the DNS as: "tac-lb21.tac-mb1a.tac-hb0b.5gstac.5gc.mnc012.mcc345.3gppnetwork.org"