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.

Switch: KIFROKMARS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
918-321 A Kiefer OK 9533 SOUTHWESTERN BELL 538      
918-321 1 Kiefer OK 9533 SOUTHWESTERN BELL 538      
918-321 3 Kiefer OK 9533 SOUTHWESTERN BELL 538      
918-321 5 Kiefer OK 9533 SOUTHWESTERN BELL 538      
918-322 A Kiefer OK 9533 SOUTHWESTERN BELL 538      
918-322 3 Kiefer OK 9533 SOUTHWESTERN BELL 538      
918-322 5 Kiefer OK 9533 SOUTHWESTERN BELL 538      
918-322 6 Kiefer OK 9533 SOUTHWESTERN BELL 538      

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.