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: 440

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
956-440 A Harlingen TX HRLNTXHGDS0  9533 SOUTHWESTERN BELL 568      
956-440 0 Harlingen TX HRLNTXHGDS0  9533 SOUTHWESTERN BELL 568      
956-440 1 Harlingen TX HRLNTXHGDS0  9533 SOUTHWESTERN BELL 568      
956-440 2 Harlingen TX HRLNTXHGDS0  9533 SOUTHWESTERN BELL 568      
956-440 3 Harlingen TX HRLNTXHGDS0  9533 SOUTHWESTERN BELL 568      
956-440 4 Harlingen TX HRLNTXHGDS0  9533 SOUTHWESTERN BELL 568      
956-440 5 Harlingen TX HRLNTXKX7MD  5562 METROPCS, INC. 568   2019-02-25   
956-440 6 Harlingen TX HRLNTXHGDS0  9533 SOUTHWESTERN BELL 568      
956-440 7 Harlingen TX HRLNTXHGDS0  9533 SOUTHWESTERN BELL 568      
956-440 8 Harlingen TX HRLNTXHGDS0  9533 SOUTHWESTERN BELL 568      
956-440 9 Harlingen TX HRLNTXHGDS0  9533 SOUTHWESTERN BELL 568      

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.