NPAC Access

How you can gain access to the world’s largest number portability registry

The Number Portability Administration Center (NPAC) is the system that supports the implementation of local number portability (LNP) and is used to facilitate number porting in the United States. 

A key component to making number portability work is the Location Routing Number (LRN). A LRN is a unique 10-digit telephone number assigned to each service provider’s switch. By using the LRN in the port record, a telephone number is directed from the current service provider switch to the new service provider switch.

To facilitate porting, a service provider sends porting information, called “subscription version” information, to the NPAC.   Service providers can do this directly or through a third-party entity known as a Service Bureau.  There are three ways that this information can be exchanged, including a:

  • Non-mechanized web-based Low Tech Interface (LTI)
  • Mechanized Service Order Administration (SOA) system
  • Call to the NPAC customer service personnel


Once a ported number is activated, real-time network downloads are sent from the NPAC to the service provider’s or service bureau’s Local Service Management System (LSMS).