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: 925 [Rate centres in NPA 925] [Dial plan for NPA 925]

NXX: 957

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
925-957 A Martinez CA MRTZCA11DS0  9740 PACIFIC BELL 722      
925-957 0 Martinez CA MRTZCA11DS0  9740 PACIFIC BELL 722      
925-957 1 Martinez CA MRTZCA11DS0  9740 PACIFIC BELL 722      
925-957 2 Martinez CA MRTZCA11DS0  9740 PACIFIC BELL 722      
925-957 3 Martinez CA SNFCCA21XOZ  321J HD CARRIER LLC 722   2013-04-05   
925-957 4 Martinez CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2013-04-05   
925-957 5 Martinez CA MRTZCA11DS0  9740 PACIFIC BELL 722      
925-957 6 Martinez CA OKLDCA03XOY  318J COMCAST IP PHONE, LLC 722   2007-03-08   
925-957 7 Martinez CA MRTZCA11DS0  9740 PACIFIC BELL 722      
925-957 8 Martinez CA MRTZCA11DS0  9740 PACIFIC BELL 722      
925-957 9 Martinez CA MRTZCA11DS0  9740 PACIFIC BELL 722      

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.