Number Portability Administration Center
The Number Portability Administration Centers (NPACs) are the registries that enable consumers and businesses in the U. S. and Canada to maintain their telephone numbers when they change service providers. The US NPAC contains routing information on ported TNs and pooled blocks and facilitates the updating of the routing databases of all subtending SPs in the portability area. The Canadian NPAC contains routing information on ported TNs and facilitates the updating of the routing databases of all subtending SPs in the portability area.