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: 677

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
956-677 A Harlingen TX HRLNTXHGXNX  965H FRACTEL, LLC 568      
956-677 0 Harlingen TX HRLNTXDU2MD  939H COMMIO, LLC 568   2024-01-20   
956-677 1 Harlingen TX HRLNTXDU2MD  939H COMMIO, LLC 568   2024-01-20   
956-677 7 Harlingen TX HRLNTXHGXNX  965H FRACTEL, LLC 568   2019-10-23   
956-677 8 Harlingen TX HRLNTXDU2MD  939H COMMIO, LLC 568   2024-01-20   
956-677 9 Harlingen TX HRLNTXDU2MD  939H COMMIO, LLC 568   2024-01-20   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.