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: BYTWTXXAHMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
281-699 A Crosby TX 903C ONVOY, LLC - TX 560      
346-233 A Baytown TX 903C ONVOY, LLC - TX 560      
346-344 A Crosby TX 903C ONVOY, LLC - TX 560      
346-466 A Highlands TX 903C ONVOY, LLC - TX 560      
346-480 A Crosby TX 903C ONVOY, LLC - TX 560      
346-485 A Huffman TX 903C ONVOY, LLC - TX 560      
346-496 A Beach City TX 903C ONVOY, LLC - TX 560      
346-567 A Mont Belvieu TX 903C ONVOY, LLC - TX 560      
346-663 A Highlands TX 903C ONVOY, LLC - TX 560      
346-682 A Crosby TX 903C ONVOY, LLC - TX 560   2024-05-19   
346-910 A Mont Belvieu TX 903C ONVOY, LLC - TX 560      
713-424 A Baytown TX 903C ONVOY, LLC - TX 560      
713-565 A Huffman TX 903C ONVOY, LLC - TX 560      
713-903 A Baytown TX 903C ONVOY, LLC - TX 560      
832-307 A Mont Belvieu TX 903C ONVOY, LLC - TX 560      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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