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: 433

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
628-433 A Ignacio CA SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722      
628-433 0 Ignacio CA   981E BANDWIDTH.COM CLEC, LLC - CA 722   2019-05-10   
628-433 1 Ignacio CA   981E BANDWIDTH.COM CLEC, LLC - CA 722   2019-05-10   
628-433 2 Ignacio CA   981E BANDWIDTH.COM CLEC, LLC - CA 722   2019-05-10   
628-433 3 Ignacio CA   965H FRACTEL, LLC 722   2019-07-16   
628-433 4 Ignacio CA   649C ONVOY, LLC - CA 722   2019-07-28   
628-433 5 Ignacio CA   649C ONVOY, LLC - CA 722   2020-08-17   
628-433 6 Ignacio CA   649C ONVOY, LLC - CA 722   2019-07-28   
628-433 8 Ignacio CA   649C ONVOY, LLC - CA 722   2021-08-09   
628-433 9 Ignacio CA   515J IP HORIZON LLC 722   2021-05-01   

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.