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: 552

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
650-552 A Millbrae CA MLBRCA11DS0  9740 PACIFIC BELL 722      
650-552 0 Millbrae CA MLBRCA11DS0  9740 PACIFIC BELL 722      
650-552 1 Millbrae CA MLBRCA11DS0  9740 PACIFIC BELL 722      
650-552 2 Millbrae CA MLBRCA11DS0  9740 PACIFIC BELL 722      
650-552 3 Millbrae CA   145J TERRA NOVA TELECOM INC. 722   2021-01-06   
650-552 4 Millbrae CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2021-10-29   
650-552 5 Millbrae CA MLBRCA11DS0  9740 PACIFIC BELL 722      
650-552 6 Millbrae CA SNVACAHZ0MD  508J CENTURYLINK COMMUNICATIONS, LLC 722   2015-02-02   
650-552 7 Millbrae CA SNJUCACLDS1  373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 722   2010-05-29   
650-552 8 Millbrae CA SNFCCAMKX1X  9262 UTILITY TELECOM GROUP, LLC - CA 722   2009-03-15   
650-552 9 Millbrae CA MLBRCA11DS0  9740 PACIFIC BELL 722      

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.