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: 553

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
956-553 A Harlingen TX HRLNTXHGXKX  624H ONVOY SPECTRUM, LLC 568      
956-553 2 Harlingen TX HRLNTXHGMMD  004F BANDWIDTH.COM CLEC, LLC - TX 568   2020-11-14   
956-553 3 Harlingen TX HRLNTXHGMMD  004F BANDWIDTH.COM CLEC, LLC - TX 568   2020-11-14   
956-553 4 Harlingen TX HRLNTXHGMMD  004F BANDWIDTH.COM CLEC, LLC - TX 568   2020-11-14   
956-553 5 Harlingen TX HRLNTXHGXKX  624H ONVOY SPECTRUM, LLC 568   2020-07-07   
956-553 6 Harlingen TX HRLNTXHGXKX  624H ONVOY SPECTRUM, LLC 568   2020-07-07   
956-553 7 Harlingen TX HRLNTXHGXKX  624H ONVOY SPECTRUM, LLC 568   2020-07-07   
956-553 9 Harlingen TX HRLNTXHGXKX  624H ONVOY SPECTRUM, LLC 568   2020-07-07   

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.