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: 972 [Rate centres in NPA 972] [Dial plan for NPA 972]

NXX: 457

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
972-457 A Irving TX DLLSTXALDS4  903C ONVOY, LLC - TX 552      
972-457 0 Irving TX IRNGTXXBXQX  583C TIME WARNER CBLE INFO SVC (TX) DBA TIME WARNER CBL 552   2014-12-07   
972-457 1 Irving TX DLLSTXALDS4  903C ONVOY, LLC - TX 552   2012-06-24   
972-457 2 Irving TX DLLSTXALDS4  903C ONVOY, LLC - TX 552   2012-06-24   
972-457 3 Irving TX DLLATX37DS6  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552   2013-11-10   
972-457 4 Irving TX DLLFTXFQDS1  7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 552   2013-09-26   
972-457 5 Irving TX DLLSTXJFDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552   2013-07-22   
972-457 6 Irving TX DLLSTXJFDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552   2013-07-22   
972-457 7 Irving TX DLLSTXJFDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552   2013-07-22   
972-457 8 Irving TX DLLSTXJFDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552   2013-07-22   
972-457 9 Irving TX FTWQTXFH0MD  508J CENTURYLINK COMMUNICATIONS, LLC 552   2014-02-18   

Last updated: Wed, 07 Feb 2024 04:12:25 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.