LERG� Routing Guide
The iconectiv® LERG Routing Guide is an output from the BIRRDS database. It is used by Service Providers (SP) and other carriers as a common means to reflect and exchange current and planned Central Office (CO) Code (NPA-NXX) and Thousands-Block (NPA-NXX-X) assignments along with associated routing data. Data is provided for all SPs in the North American Numbering Plan (NANP). It is generated monthly in its entirety, with daily change activity also available. contains information about the local routing data obtained from the BIRRDS. This information reflects the current network configuration and scheduled network changes for all entities originating or terminating PSTN calls within the NANP.
(iconectiv is a registered trademark and LERG is a trademark of iconectiv, LLC. )