Inter-carrier or competitive porting
When a telephone number moves from the current Service Provider to a new Service Provider.
When a telephone number moves from one switch to another within the same telecommunications Service Provider's network.
When a telephone number moves to a new Service Provider in blocks of 1,000 to create an inventory of unassigned telephone numbers.
How LRN Enables LNP
The LRN serves as the network address. It includes the NPA and the NXX for each telephone number. A single LRN can be used for every ported number served between a switch and the NPA/NXX-assigned location. The assignment of an LRN allows for LNP.