Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 256 [Rate centres in NPA 256] [Dial plan for NPA 256]

NXX: 664

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
256-664 A Killen AL HNVIALUNX0X  5255 LEVEL 3 COMMUNICATIONS, LLC - AL 477      
256-664 1 Killen AL   072F BANDWIDTH.COM CLEC, LLC - AL 477   2014-09-01   
256-664 2 Killen AL   604E ONVOY, LLC - AL 477   2021-01-22   
256-664 3 Killen AL   8271 TELEPORT COMMUNICATIONS AMERICA, LLC - AL 477   2016-05-19   
256-664 4 Killen AL   5255 LEVEL 3 COMMUNICATIONS, LLC - AL 477   2004-12-20   
256-664 5 Killen AL   604E ONVOY, LLC - AL 477   2017-03-13   
256-664 6 Killen AL   604E ONVOY, LLC - AL 477   2021-01-22   
256-664 7 Killen AL   604E ONVOY, LLC - AL 477   2016-07-18   
256-664 8 Killen AL   604E ONVOY, LLC - AL 477   2016-07-18   
256-664 9 Killen AL   073H TELNYX LLC 477   2018-12-27   

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

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