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: 355

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
251-355 A Mobile AL MOBLALAZX6Z  604E ONVOY, LLC - AL 480      
251-355 0 Mobile AL   604E ONVOY, LLC - AL 480   2017-10-21   
251-355 1 Mobile AL   604E ONVOY, LLC - AL 480   2017-10-21   
251-355 2 Mobile AL   604E ONVOY, LLC - AL 480   2017-10-21   
251-355 3 Mobile AL   604E ONVOY, LLC - AL 480   2017-10-21   
251-355 4 Mobile AL   604E ONVOY, LLC - AL 480   2017-10-21   
251-355 5 Mobile AL   5562 METROPCS, INC. 480   2017-11-17   
251-355 6 Mobile AL   773F MCC TELEPHONY OF THE SOUTH, LLC - AL 480   2018-08-11   
251-355 7 Mobile AL   829J PAETEC ITEL, LLC 480   2018-08-07   
251-355 8 Mobile AL   5562 METROPCS, INC. 480   2018-06-26   
251-355 9 Mobile AL   6214 NEW CINGULAR WIRELESS PCS, LLC - GA 480   2020-03-15   

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.