The NPAC: The definitive source for facilitating number porting 

The U.S. Number Portability Administration Center (NPAC) supports the implementation of Local Number Portability, which enables customers in the United States to keep their telephone number when switching service providers. Comprised of seven regional systems, the NPAC facilitates number porting across all Service Providers in the United States, including wireline, wireless and Voice over Internet Protocol (VoIP) providers. Once registered, authorized NPAC users can access the NPAC Customer Portal training materials, user documentation, billing and support information.

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While NPAC access is available exclusively to service providers and providers of telecom-related services, certain key number portability data elements are available for law enforcement and public safety, TCPA compliance and fraud mitigation and risk assessment. Have questions about which companies can access NPAC data and for what purposes? Download the Power of Number Porting document.