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: HSTNTX08X0X

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
346-220 8 Spring TX 763H IP GLOBAL NETWORKS - TX 560   2016-04-16   
346-239 5 Richmond-Rosenberg TX 763H IP GLOBAL NETWORKS - TX 560   2016-04-16   
346-252 0 Houston Suburban TX 763H IP GLOBAL NETWORKS - TX 560   2016-04-16   
346-294 A Houston TX 763H IP GLOBAL NETWORKS - TX 560      
346-294 0 Houston TX 763H IP GLOBAL NETWORKS - TX 560   2018-03-10   
346-294 1 Houston TX 763H IP GLOBAL NETWORKS - TX 560   2018-03-10   
346-404 A Houston TX 763H IP GLOBAL NETWORKS - TX 560      
346-404 0 Houston TX 763H IP GLOBAL NETWORKS - TX 560   2016-04-16   
713-814 7 Houston TX 763H IP GLOBAL NETWORKS - TX 560   2017-11-13   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

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