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: 346

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
346-346 A Friendswood TX HSTQTXRG6MD  473F USFON, INC. - TX 560      
346-346 0 Friendswood TX   903C ONVOY, LLC - TX 560   2024-03-09   
346-346 1 Friendswood TX   073H TELNYX LLC 560   2024-03-24   
346-346 2 Friendswood TX   473F USFON, INC. - TX 560   2023-03-27   
346-346 3 Friendswood TX   473F USFON, INC. - TX 560   2023-03-27   
346-346 4 Friendswood TX   473F USFON, INC. - TX 560   2023-03-27   
346-346 5 Friendswood TX   473F USFON, INC. - TX 560   2023-03-27   
346-346 6 Friendswood TX   473F USFON, INC. - TX 560   2023-03-27   
346-346 7 Friendswood TX   473F USFON, INC. - TX 560   2023-03-27   
346-346 8 Friendswood TX   473F USFON, INC. - TX 560   2023-03-27   
346-346 9 Friendswood TX   473F USFON, INC. - TX 560   2023-03-27   

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

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.