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: 957

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
256-957 A Decatur AL HNVIALUNX6X  604E ONVOY, LLC - AL 477      
256-957 0 Decatur AL HNVIALUNXZY  073H TELNYX LLC 477   2021-03-15   
256-957 1 Decatur AL HNVIAL18X4X  6804 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 477   2021-04-15   
256-957 2 Decatur AL HNVIAL18X4X  6804 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 477   2021-07-28   
256-957 3 Decatur AL HNVIALODAMD  6214 NEW CINGULAR WIRELESS PCS, LLC - GA 477   2021-08-13   
256-957 4 Decatur AL HNVIALODAMD  6214 NEW CINGULAR WIRELESS PCS, LLC - GA 477   2021-08-13   
256-957 5 Decatur AL HNVIALUNX6X  604E ONVOY, LLC - AL 477   2024-08-07   
256-957 6 Decatur AL HNVIALUNX6X  604E ONVOY, LLC - AL 477   2021-07-30   
256-957 7 Decatur AL HNVIALUNXIX  072F BANDWIDTH.COM CLEC, LLC - AL 477   2022-11-04   
256-957 8 Decatur AL HNVIAL18X4X  6804 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 477   2021-05-17   
256-957 9 Decatur AL HNVIAL18X4X  6804 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 477   2021-06-28   

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.