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: 650 [Rate centres in NPA 650] [Dial plan for NPA 650]

NXX: 777

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
650-777 A Millbrae CA MLBRCA11DS0  9740 PACIFIC BELL 722      
650-777 0 Millbrae CA   9740 PACIFIC BELL 722      
650-777 1 Millbrae CA   965H FRACTEL, LLC 722   2019-07-13   
650-777 2 Millbrae CA   9262 UTILITY TELECOM GROUP, LLC - CA 722   2006-06-14   
650-777 3 Millbrae CA   965H FRACTEL, LLC 722   2019-07-13   
650-777 4 Millbrae CA   9740 PACIFIC BELL 722      
650-777 5 Millbrae CA   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2006-03-25   
650-777 6 Millbrae CA   965H FRACTEL, LLC 722   2019-07-13   
650-777 7 Millbrae CA   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2004-10-16   
650-777 8 Millbrae CA   649C ONVOY, LLC - CA 722   2013-03-01   
650-777 9 Millbrae CA   9740 PACIFIC BELL 722      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.