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: HSTNTXMOX6X

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
346-510 A Houston TX 624H ONVOY SPECTRUM, LLC 560      
346-640 A Langham Creek TX 624H ONVOY SPECTRUM, LLC 560      
713-810 A Tomball TX 624H ONVOY SPECTRUM, LLC 560   2022-01-17   
979-379 A Clute-Lake Jackson TX 624H ONVOY SPECTRUM, LLC 560      

Last updated: Fri, 01 Jul 2022 02:53:40 UTC

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