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: 660

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
956-660 A Harlingen TX HRLNTXHGXFX  508J CENTURYLINK COMMUNICATIONS, LLC 568      
956-660 0 Harlingen TX HRLNTXKX8MD  5562 METROPCS, INC. 568   2017-02-07   
956-660 6 Harlingen TX HRLNTXKX8MD  5562 METROPCS, INC. 568   2016-07-28   
956-660 7 Harlingen TX HRLNTXHGXFX  508J CENTURYLINK COMMUNICATIONS, LLC 568   2016-02-20   

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.