U.S. Number Portability

Access U.S. number portability data from the only authorized source 

Our nation relies on connectivity. Companies require access to data regarding our nation’s 850 million phone numbers to perform vital day-to-day operations, such as routing, rating, billing and telecommunication network maintenance. However, millions of businesses and consumers switch Service Providers each year. This makes accessing the most recent data critical. 

The U.S. Number Portability Administration Center (NPAC) is the authoritative source for phone number porting information for all Service Providers in the United States, including wireline, wireless and Voice over Internet Protocol (VoIP) providers.  It can be used by authorized Service Providers and Providers of Telecom-Related Services (PTRS) for routing, rating, billing and network maintenance. In addition, businesses can access and use specific NPAC data for multiple purposes, including:

  • Law enforcement investigations
  • TCPA compliance (NPAC data can be used for certain elements of TCPA compliance.)
  • Risk assessment and fraud mitigation

Eligible businesses, including service providers and PTRS, can do so by subscribing to one or more of the solutions listed below.


Solutions to meet your needs

Each of these solutions has been designed to allow businesses and organizations to access the information they require to perform specific functions. Organizations can subscribe to one or more in order to meet their unique requirements.

PortData Validate: for fraud mitigation and risk assessment

If you are in the fraud mitigation and risk assessment business, you can’t afford to rely on old data to make new decisions. PortData Validate lets you know if your customer recently switched Services Providers, which is a critical indicator to consider before you approve a financial transaction or release private information.

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PortData Comply: for marketing, research and TCPA compliance

Does your business have to comply with the Telephone Consumer Protection Act (TCPA) and wireless “do not call” laws that prohibit the use of autodialers and pre-recorded voice messages? PortData Comply is the country’s only authoritative source of the data needed to verify if a telephone number has been ported between wireless and wireline.

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PortData Source: for law enforcement and public safety

When verifying a phone number during your investigation, you want to know that your data is updated and accurate. As the nation’s sole authoritative numbering database, PortData Source can help you quickly verify phone number porting history and give you the Service Provider’s Law Enforcement Emergency Contact information.

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Authorized NPAC users

There are strict guidelines on how NPAC data can be used. Authorized NPAC users can access data for routing, rating, billing and network maintenance in connection with providing or facilitating the provision of telecommunications services. Authorized service providers include:

  •  Those that have an Operating Company Number (OCN) issued from the National Exchange Carrier Association (NECA), hold an Operating Authority, Certificate of Public Convenience and Necessity (CPCN), Radio License or VoIP Proof of Numbering and participate in porting numbers. Authorized Providers of Telecom-Related Services (PTRS), include:


Authorized Providers of Telecom-related Services (PTRS), including:

  • Those that route, bill or rate telephone calls or perform network maintenance.
  • Interconnected VoIP providers that are not eligible to obtain numbering resources from the North American Numbering Plan Administration (NANPA)
  • Non-facilities-based resellers of interconnected VoIP services that use the number resources and facilities of an interconnected VoIP provider or traditional Public Switch Telephone Number (PSTN) reseller
  • Service Bureaus that perform porting work on behalf of a Service Provider

Review the Permitted Uses to learn more.


The LNPA Working Group, is the body that makes the decisions and recommendations that form the basis of the regulatory orders.

LNP stands for Local Number Portability. You may also hear it referred to as number portability, wireless number portability or number porting.