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: 850

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
256-850 A Madison AL HNVIALUNXIZ  9236 NETWORK TELEPHONE CORPORATION - AL 477      
256-850 0 Madison AL HNVIALUNX0X  5255 LEVEL 3 COMMUNICATIONS, LLC - AL 477   2004-12-28   
256-850 1 Madison AL HNVIALUNX6X  604E ONVOY, LLC - AL 477   2016-07-18   
256-850 2 Madison AL HNVIALUNX6X  604E ONVOY, LLC - AL 477   2016-07-18   
256-850 3 Madison AL HNVIALUNX0X  5255 LEVEL 3 COMMUNICATIONS, LLC - AL 477   2005-12-29   
256-850 4 Madison AL HNVIALUNX0X  5255 LEVEL 3 COMMUNICATIONS, LLC - AL 477   2003-09-20   
256-850 5 Madison AL HNVIALUNXHX  8271 TELEPORT COMMUNICATIONS AMERICA, LLC - AL 477   2017-07-10   
256-850 6 Madison AL HNVIAL180MD  7469 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AL 477   2019-02-14   
256-850 7 Madison AL HNVIAL180MD  7469 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AL 477   2009-11-01   
256-850 8 Madison AL HNVIALUNXHX  8271 TELEPORT COMMUNICATIONS AMERICA, LLC - AL 477   2018-10-14   
256-850 9 Madison AL HNVIALUNXIZ  9236 NETWORK TELEPHONE CORPORATION - AL 477      

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.