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: 299

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
251-299 A Mount Vernon AL MOBLALAZXJZ  773F MCC TELEPHONY OF THE SOUTH, LLC - AL 480      
251-299 0 Mount Vernon AL   604E ONVOY, LLC - AL 480   2016-03-11   
251-299 1 Mount Vernon AL   773F MCC TELEPHONY OF THE SOUTH, LLC - AL 480   2010-07-18   
251-299 2 Mount Vernon AL   5255 LEVEL 3 COMMUNICATIONS, LLC - AL 480   2014-06-28   
251-299 3 Mount Vernon AL   7221 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AL 480   2013-06-01   
251-299 4 Mount Vernon AL   072F BANDWIDTH.COM CLEC, LLC - AL 480   2019-06-07   
251-299 5 Mount Vernon AL   073H TELNYX LLC 480   2020-05-02   
251-299 6 Mount Vernon AL   604E ONVOY, LLC - AL 480   2019-04-01   
251-299 7 Mount Vernon AL   508J CENTURYLINK COMMUNICATIONS, LLC 480   2014-05-13   
251-299 8 Mount Vernon AL   604E ONVOY, LLC - AL 480   2016-03-11   
251-299 9 Mount Vernon AL   604E ONVOY, LLC - AL 480   2019-04-01   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.