Telephone Directory - Reverse Directories

Reverse Directories

A reverse telephone directory is sorted by number, which can be looked up to give the name and address of the subscriber. Reverse telephone directories are used by law enforcement and other emergency services to determine the origin of any request for assistance. These systems include both publicly accessible (listed) and private (unlisted) services. As such, these directories are restricted to internal use only. Publicly accessible reverse telephone directories are provided as part of the standard directory services from the telecommunications carrier in some countries.