About the NPAC

The world’s largest number portability registry

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There was a time when consumers had to change their telephone number when switching service providers. That changed when local number portability (LNP) was mandated as part of the Telecommunications Act of 1996. The act was designed to increase competition among service providers, stimulate demand for telecommunication services and encourage technology innovation. Today, nearly everyone in the U.S. can port their phone number.

The Number Portability Administration Center (NPAC) is the system that supports the implementation of LNP and is used to facilitate number porting in the United States. Comprised of seven regional systems across the U.S., the NPAC supports number portability for all telecom Service Providers in the United States, including wireline, wireless and Voice over Internet Protocol (VoIP) providers.

Since the NPAC contains proprietary data from thousands of telecommunications service providers–many of which are in direct competition with each other --access to NPAC data is limited to specific, permitted uses. Becoming an authorized NPAC user is limited to service providers, service bureaus and providers of related services.  


Other users who are able to use NPAC data

While NPAC authorized users are service providers, service bureaus and PTRS users, other entities are permitted to access certain data including:

U.S. law enforcement agencies and public safety providers. These users are permitted to access NPAC data to identify current service providers and the service providers’ points of contact for ported telephone numbers.

Businesses that must comply with Wireless Do Not Call lists are permitted to use NPAC data to verify when telephone numbers have been ported between a wireline and a wireless service provider. This allows them to comply with the TCPA.