LAC (Location Area Code) is per mobile industry numbering specifications, the Location Area Code (LAC) is one of three identifiers that define the international value known as Location Area Identity (LAI). A Location Area is a set of Routing Areas controlled by an SGSN. The Location Area Identity is composed of the Mobile Country Code (MCC) and Mobile Network Code (MNC) of the operator and the Location Area Code. The Location Area Code identifies a location within the Public Land Mobile Network (PLMN). See also RAC (Routing Area Code).