LERG Routing Guide
The Local Exchange Routing Guide is a database of telecommunications numbering resources for use in the administration and operation of the North American Numbering Plan by the NANP administrator and telecommunications service providers. This data supports the local exchange network of the NANP and identifies planning changes in the network.
The database has been maintained by private sector entities assigned by the Federal Communications Commission to perform the NANPA function.
The database is produced in the TruOps Telecom Routing Administration product group of iconectiv, LLC, formerly named Telcordia, a division of Ericsson since 2012.