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: 623

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
346-623 A Satsuma TX HSTNTX01G04  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560      
346-623 0 Satsuma TX   073H TELNYX LLC 560   2023-03-05   
346-623 1 Satsuma TX   903C ONVOY, LLC - TX 560   2023-07-15   
346-623 2 Satsuma TX   903C ONVOY, LLC - TX 560   2023-05-13   
346-623 3 Satsuma TX   903C ONVOY, LLC - TX 560   2023-03-06   
346-623 4 Satsuma TX   903C ONVOY, LLC - TX 560   2023-03-06   
346-623 5 Satsuma TX   903C ONVOY, LLC - TX 560   2023-06-22   
346-623 6 Satsuma TX   903C ONVOY, LLC - TX 560   2024-02-25   
346-623 7 Satsuma TX   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2023-03-04   
346-623 8 Satsuma TX   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2023-03-04   
346-623 9 Satsuma TX   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2023-03-04   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.