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.

Switch: HRLNTXHGBMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
956-507 A Harlingen TX 319D FOREMOST TELECOMMUNICATIONS CORPORATION - TX 568      
956-588 A Pharr TX 319D FOREMOST TELECOMMUNICATIONS CORPORATION - TX 568      
956-777 A McAllen TX 319D FOREMOST TELECOMMUNICATIONS CORPORATION - TX 568      
956-887 A La Feria TX 319D FOREMOST TELECOMMUNICATIONS CORPORATION - TX 568      
956-888 A Mission TX 319D FOREMOST TELECOMMUNICATIONS CORPORATION - TX 568      
956-900 A Edinburg TX 319D FOREMOST TELECOMMUNICATIONS CORPORATION - TX 568      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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