Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 279 [Rate centres in NPA 279] [Dial plan for NPA 279]

NXX: 500

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
279-500 A Michigan Bar CA SCRMCA0104Z  965H FRACTEL, LLC 726      
279-500 0 Michigan Bar CA   965H FRACTEL, LLC 726   2020-01-28   
279-500 1 Michigan Bar CA   373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 726   2020-08-24   
279-500 2 Michigan Bar CA   649C ONVOY, LLC - CA 726   2020-03-02   
279-500 3 Michigan Bar CA   649C ONVOY, LLC - CA 726   2020-06-26   
279-500 4 Michigan Bar CA   649C ONVOY, LLC - CA 726   2020-06-26   
279-500 5 Michigan Bar CA   965H FRACTEL, LLC 726   2020-01-28   
279-500 6 Michigan Bar CA   649C ONVOY, LLC - CA 726   2020-06-26   
279-500 7 Michigan Bar CA   965H FRACTEL, LLC 726   2020-01-28   
279-500 8 Michigan Bar CA   649C ONVOY, LLC - CA 726   2020-12-03   
279-500 9 Michigan Bar CA   649C ONVOY, LLC - CA 726   2020-12-03   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.