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: 477

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
346-477 A Humble TX HSTNTXJAXBY  965H FRACTEL, LLC 560      
346-477 0 Humble TX HSTNTXYAHMD  073H TELNYX LLC 560   2021-03-19   
346-477 1 Humble TX HSTNTX01G04  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2021-05-17   
346-477 2 Humble TX HSTNTXMOX7X  318J COMCAST IP PHONE, LLC 560   2020-11-07   
346-477 3 Humble TX HSTNTXYADS5  903C ONVOY, LLC - TX 560   2021-02-18   
346-477 4 Humble TX HSTNTXMOX7X  318J COMCAST IP PHONE, LLC 560   2020-11-07   
346-477 5 Humble TX HSTNTX01G04  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2021-05-17   
346-477 6 Humble TX HSTNTXMOX7X  318J COMCAST IP PHONE, LLC 560   2020-11-07   
346-477 7 Humble TX HSTNTXJAXBY  965H FRACTEL, LLC 560   2020-09-05   
346-477 8 Humble TX HSTNTXYADS5  903C ONVOY, LLC - TX 560   2020-11-30   
346-477 9 Humble TX HSTNTXYADS5  903C ONVOY, LLC - TX 560   2020-11-30   

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.