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: HSTNTXJADS6

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
346-222 A La Porte TX 319D FOREMOST TELECOMMUNICATIONS CORPORATION - TX 560      
346-333 A Langham Creek TX 319D FOREMOST TELECOMMUNICATIONS CORPORATION - TX 560      
346-444 A Houston TX 319D FOREMOST TELECOMMUNICATIONS CORPORATION - TX 560      
346-777 A Bammel TX 319D FOREMOST TELECOMMUNICATIONS CORPORATION - TX 560      
346-888 A Houston Suburban TX 319D FOREMOST TELECOMMUNICATIONS CORPORATION - TX 560      
346-999 A Huffman TX 319D FOREMOST TELECOMMUNICATIONS CORPORATION - TX 560      
409-888 A Galveston TX 319D FOREMOST TELECOMMUNICATIONS CORPORATION - TX 560      
832-844 A Houston TX 319D FOREMOST TELECOMMUNICATIONS CORPORATION - TX 560      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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