Database in mobile telecommunications networks which holds the subscriber data for mobile customers. Every user is allocated to an HLR. The HLR provides network-internal information on the services to which subscribers have subscribed. It also contains details of the present whereabouts of the customer – without this information, roaming is not possible.

The Home Location Register in a mobile communication system keeps track of a mobile terminal's current location. In mobile IP systems, the resolution is the mobile computer's current Foreign Agent. In mobile telephony systems, the resolution is usually the remote system; not the mobile telephone's current base station. See also Home Agent.

The database in a wireless communication network that contains registration and user profile information for the system subscribers.