HLR (Home Location Register)

HLR (Home Location Register) is a database that contains various information about all of the mobile subscribers of a mobile network such as the mobile numbers, services, whether the numbers have been ported to another network and similar information.

Home Location Register lookup (HLR Lookup) is a service that dynamically contacts a central database (on the operator’s side) that contains details of each mobile phone subscriber authorized to use the GSM core network.

Infobip's HLR service is called Number Lookup.