Section: 19.4.2.5 Routing Area Identity (RAI) - EPC
Content: The Routing Area Identity (RAI) consists of a RAC, LAC, MNC and MCC. A subdomain name for use by core network nodes based on RAI shall be derived from the MNC and MCC by adding the label "rac" to the beginning of the Home Network Realm/Domain (see clause 19.2). The RAI FQDN shall be constructed as: rac<RAC>.lac<LAC>.rac.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org <RAC> and <LAC> shall be Hex coded digits representing the LAC and RAC codes respectively. If there are less than 4 significant digits in <RAC> or <LAC>, one or more "0" digit(s) is/are inserted at the left side to fill the 4 digit coding. Note: Above subdomain is for release 8 core network nodes to allow DNS records other than A/AAAA records. The subdomain name in Annex C.2 are still used for existing A/AAAA records for pre-Release 8 nodes and are also still used for backward compatibility.