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.

NPA: 346 [Rate centres in NPA 346] [Dial plan for NPA 346]

NXX: 440

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
346-440 A Houston Suburban TX HSTNTXMOX7X  318J COMCAST IP PHONE LLC 560   2021-01-14   
346-440 0 Houston Suburban TX HSTNTXGI0MD  004F BANDWIDTH.COM CLEC, LLC - TX 560   2020-11-27   
346-440 1 Houston Suburban TX HSTNTXGI0MD  004F BANDWIDTH.COM CLEC, LLC - TX 560   2020-11-27   
346-440 2 Houston Suburban TX HSTNTXGI0MD  004F BANDWIDTH.COM CLEC, LLC - TX 560   2021-03-14   
346-440 3 Houston Suburban TX HSTNTXYADS5  903C ONVOY, LLC - TX 560   2020-11-30   
346-440 4 Houston Suburban TX HSTNTXYADS5  903C ONVOY, LLC - TX 560   2020-11-30   
346-440 5 Houston Suburban TX HSTNTX08ZMD  553J WHITESKY COMMUNICATIONS LLC 560   2021-05-09   
346-440 6 Houston Suburban TX   624H ONVOY SPECTRUM, LLC 560   2022-02-20   
346-440 7 Houston Suburban TX HSTNTXMOX7X  318J COMCAST IP PHONE LLC 560   2020-11-26   
346-440 8 Houston Suburban TX HSTNTXMOX7X  318J COMCAST IP PHONE LLC 560   2020-11-26   
346-440 9 Houston Suburban TX HSTNTXMOX7X  318J COMCAST IP PHONE LLC 560   2020-11-26   

Last updated: Fri, 13 May 2022 22:16:13 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.