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: 956 [Rate centres in NPA 956] [Dial plan for NPA 956]

NXX: 422

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
956-422 A Roma TX HRLNTXHGX7X  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 568      
956-422 0 Roma TX HRLNTXKX8MD  4290 STPCS JOINT VENTURE, LLC 568   2013-10-06   
956-422 1 Roma TX HRLNTXKX8MD  4290 STPCS JOINT VENTURE, LLC 568   2013-10-06   
956-422 2 Roma TX HRLNTXHGX7X  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 568   2013-12-06   
956-422 3 Roma TX HRLNTXHGMMD  004F BANDWIDTH.COM CLEC, LLC - TX 568   2014-05-16   
956-422 4 Roma TX HRLNTXKX8MD  4290 STPCS JOINT VENTURE, LLC 568   2015-01-10   
956-422 5 Roma TX HRLNTXKX8MD  4290 STPCS JOINT VENTURE, LLC 568   2020-09-07   
956-422 6 Roma TX HRLNTXKX8MD  4290 STPCS JOINT VENTURE, LLC 568   2016-03-14   
956-422 7 Roma TX HRLNTXHGXFX  508J CENTURYLINK COMMUNICATIONS, LLC 568   2016-03-12   
956-422 8 Roma TX HRLNTXKX8MD  4290 STPCS JOINT VENTURE, LLC 568   2016-03-14   
956-422 9 Roma TX HRLNTXHGX7X  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 568   2013-08-29   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.