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: 257

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
925-257 A Orinda CA HYWRCA115MD  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 722      
925-257 0 Orinda CA   981E BANDWIDTH.COM CLEC, LLC - CA 722   2010-08-29   
925-257 2 Orinda CA   981E BANDWIDTH.COM CLEC, LLC - CA 722   2010-09-09   
925-257 3 Orinda CA   6010 NEW CINGULAR WIRELESS PCS, LLC 722   2016-07-15   
925-257 4 Orinda CA   981E BANDWIDTH.COM CLEC, LLC - CA 722   2011-04-01   
925-257 5 Orinda CA   553J WHITESKY COMMUNICATIONS, LLC 722   2021-09-16   
925-257 6 Orinda CA   073H TELNYX LLC 722   2021-02-26   
925-257 7 Orinda CA   516C AT&T CORP. 722   2006-07-08   
925-257 8 Orinda CA   515J IP HORIZON LLC 722   2016-09-15   
925-257 9 Orinda CA   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 722      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.