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: 406

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
256-406 A Fort Payne AL BRHMALMT32Z  604E ONVOY, LLC - AL 476   2024-02-08   
256-406 0 Fort Payne AL BRHMALMT32Z  604E ONVOY, LLC - AL 476   2024-03-08   
256-406 1 Fort Payne AL BRHMALMTY4X  624H ONVOY SPECTRUM, LLC 476   2023-06-23   
256-406 2 Fort Payne AL BRHMALMT32Z  604E ONVOY, LLC - AL 476   2024-04-06   
256-406 3 Fort Payne AL BRHMALMT32Z  604E ONVOY, LLC - AL 476   2024-05-11   
256-406 4 Fort Payne AL BRHMALMT32Z  604E ONVOY, LLC - AL 476   2024-06-29   
256-406 5 Fort Payne AL   318J COMCAST IP PHONE, LLC 476   2025-10-27   
256-406 6 Fort Payne AL   604E ONVOY, LLC - AL 476   2026-02-20   
256-406 7 Fort Payne AL BRHMALMT92Z  7475 POWERTEL BIRMINGHAM LICENSES, INC. 476   2024-03-08   
256-406 8 Fort Payne AL BRHMALMT32Z  604E ONVOY, LLC - AL 476   2023-09-10   
256-406 9 Fort Payne AL   604E ONVOY, LLC - AL 476   2026-01-11   

Last updated: Wed, 04 Mar 2026 03:00:52 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.