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: 628 [Rate centres in NPA 628] [Dial plan for NPA 628]

NXX: 254

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
628-254 A Sausalito CA SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722      
628-254 0 Sausalito CA SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722   2016-10-21   
628-254 1 Sausalito CA SNJUCACLDS1  373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 722   2016-10-22   
628-254 2 Sausalito CA SNJUCACLDS1  373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 722   2016-10-22   
628-254 3 Sausalito CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2016-10-22   
628-254 4 Sausalito CA HYWRCAMCDMD  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 722   2016-10-22   
628-254 5 Sausalito CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2017-06-17   
628-254 6 Sausalito CA   6529 T-MOBILE USA, INC. 722   2025-11-18   
628-254 7 Sausalito CA SNJUCACLDS1  373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 722   2017-07-09   
628-254 8 Sausalito CA SNJUCACL3MD  073H TELNYX LLC 722   2017-06-05   
628-254 9 Sausalito CA SNFCCAMM8MD  973E RACE TELECOMMUNICATIONS, INC. - CA 722   2016-11-20   

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.