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: 251 [Rate centres in NPA 251] [Dial plan for NPA 251]

NXX: 203

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
251-203 A Belle Fontaine AL MOBLALAZX6Z  604E ONVOY, LLC - AL 480   2024-01-07   
251-203 0 Belle Fontaine AL MOBLALAZX6Z  604E ONVOY, LLC - AL 480   2024-01-07   
251-203 1 Belle Fontaine AL MOBLALAZX6Z  604E ONVOY, LLC - AL 480   2024-01-07   
251-203 3 Belle Fontaine AL MOBLALAZ13Z  624H ONVOY SPECTRUM, LLC 480   2024-12-05   

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.