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: 423

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
346-423 A Porter TX HSTNTXMOX7X  318J COMCAST IP PHONE LLC 560   2021-01-12   
346-423 0 Porter TX   318J COMCAST IP PHONE LLC 560   2020-04-23   
346-423 1 Porter TX   566J RADIANTIQ LLC 560   2021-02-18   
346-423 2 Porter TX   903C ONVOY, LLC - TX 560   2020-08-23   
346-423 3 Porter TX   903C ONVOY, LLC - TX 560   2020-08-23   
346-423 4 Porter TX   903C ONVOY, LLC - TX 560   2020-08-23   
346-423 5 Porter TX   506J TWILIO INTERNATIONAL INC 560   2020-10-08   
346-423 6 Porter TX   903C ONVOY, LLC - TX 560   2021-01-13   
346-423 7 Porter TX   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2020-04-24   
346-423 8 Porter TX   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2020-04-24   
346-423 9 Porter TX   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2020-04-24   

Last updated: Sun, 04 Apr 2021 19:28:27 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.