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: 408 [Rate centres in NPA 408] [Dial plan for NPA 408]

NXX: 752

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
408-752 A Sunnyvale CA SNVACA11DS0  9740 PACIFIC BELL 722      
408-752 0 Sunnyvale CA   9740 PACIFIC BELL 722      
408-752 1 Sunnyvale CA   6529 T-MOBILE USA, INC. 722   2020-09-11   
408-752 2 Sunnyvale CA   981E BANDWIDTH.COM CLEC, LLC - CA 722   2012-09-07   
408-752 3 Sunnyvale CA   9740 PACIFIC BELL 722      
408-752 4 Sunnyvale CA   373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 722   2016-10-10   
408-752 5 Sunnyvale CA   649C ONVOY, LLC - CA 722   2016-11-04   
408-752 6 Sunnyvale CA   6529 T-MOBILE USA, INC. 722   2016-09-02   
408-752 7 Sunnyvale CA   9740 PACIFIC BELL 722      
408-752 8 Sunnyvale CA   7145 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 722   2010-06-06   
408-752 9 Sunnyvale CA   9740 PACIFIC BELL 722      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.