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: 256 [Rate centres in NPA 256] [Dial plan for NPA 256]

NXX: 978

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
256-978 A Sheffield AL HNVIALUNX0X  5255 LEVEL 3 COMMUNICATIONS, LLC - AL 477      
256-978 0 Sheffield AL HNVIAL03CM1  6664 SPRINT SPECTRUM, L.P. 477   2011-04-08   
256-978 1 Sheffield AL HNVIALUN0MD  4839 US LEC OF ALABAMA, INC. 477   2011-01-18   
256-978 2 Sheffield AL HNVIALUNX0X  5255 LEVEL 3 COMMUNICATIONS, LLC - AL 477   2010-12-13   
256-978 3 Sheffield AL HNVIALUNX0X  5255 LEVEL 3 COMMUNICATIONS, LLC - AL 477   2010-12-25   
256-978 4 Sheffield AL HNVIALUNXIX  072F BANDWIDTH.COM CLEC, LLC - AL 477   2011-06-20   
256-978 5 Sheffield AL HNVIALUNX7Z  318J COMCAST IP PHONE LLC 477   2011-06-24   
256-978 6 Sheffield AL HNVIALUNXHX  8271 TCG MIDSOUTH, INC. - AL 477   2011-06-20   
256-978 7 Sheffield AL   145J TERRA NOVA TELECOM INC. 477   2022-08-17   
256-978 8 Sheffield AL HNVIAL03CM1  6664 SPRINT SPECTRUM, L.P. 477   2012-02-22   
256-978 9 Sheffield AL HNVIALUNXIX  072F BANDWIDTH.COM CLEC, LLC - AL 477   2014-03-13   

Last updated: Thu, 04 Aug 2022 23:14:42 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.