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: 510 [Rate centres in NPA 510] [Dial plan for NPA 510]

NXX: 509

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
510-509 A Fremont-Newark: Main DA CA SNFCCASY5MD  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722      
510-509 0 Fremont-Newark: Main DA CA SNFCCA01GT0  6010 NEW CINGULAR WIRELESS PCS, LLC 722      
510-509 1 Fremont-Newark: Main DA CA SNFCCASY5MD  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722      
510-509 2 Fremont-Newark: Main DA CA OKLDCA03XOY  318J COMCAST IP PHONE, LLC 722      
510-509 3 Fremont-Newark: Main DA CA   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 722      
510-509 4 Fremont-Newark: Main DA CA SNFCCA01GT0  6010 NEW CINGULAR WIRELESS PCS, LLC 722      
510-509 5 Fremont-Newark: Main DA CA SNFCCA01GT0  6010 NEW CINGULAR WIRELESS PCS, LLC 722      
510-509 6 Fremont-Newark: Main DA CA   649C ONVOY, LLC - CA 722      
510-509 7 Fremont-Newark: Main DA CA   649C ONVOY, LLC - CA 722      
510-509 8 Fremont-Newark: Main DA CA SNFCCA01GT0  6010 NEW CINGULAR WIRELESS PCS, LLC 722      
510-509 9 Fremont-Newark: Main DA CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.