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: 918 [Rate centres in NPA 918] [Dial plan for NPA 918]

NXX: 257

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
918-257 A Afton OK AFTNOKMARS1  9533 SOUTHWESTERN BELL 538      
918-257 0 Afton OK   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 538   2007-12-01   
918-257 1 Afton OK   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 538      
918-257 2 Afton OK   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 538      
918-257 3 Afton OK   409F ONVOY, LLC - OK 538   2016-10-14   
918-257 4 Afton OK   9533 SOUTHWESTERN BELL 538      
918-257 5 Afton OK   9533 SOUTHWESTERN BELL 538      
918-257 6 Afton OK   409F ONVOY, LLC - OK 538   2016-10-14   
918-257 7 Afton OK   945H NORTHEAST RURAL SERVICES, INC. - OK 538   2009-10-26   
918-257 8 Afton OK   9533 SOUTHWESTERN BELL 538      
918-257 9 Afton OK   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 538   2008-12-04   

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.