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: 830 [Rate centres in NPA 830] [Dial plan for NPA 830]

NXX: 255

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
830-255 A Carrizo Springs TX SNAQTXKY7MD  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 566      
830-255 0 Carrizo Springs TX SNANTX78GT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 566   2004-04-03   
830-255 1 Carrizo Springs TX SNANTX78GT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 566   2005-03-12   
830-255 2 Carrizo Springs TX SNAQTXKY7MD  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 566   2013-07-24   
830-255 3 Carrizo Springs TX SNANTX78GT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 566   2006-07-13   
830-255 4 Carrizo Springs TX SNAQTXKY7MD  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 566      
830-255 5 Carrizo Springs TX SNANTXDIRMD  903C ONVOY, LLC - TX 566   2010-11-05   
830-255 6 Carrizo Springs TX SNANTX78GT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 566   2011-04-17   
830-255 7 Carrizo Springs TX SNANTXCA34Z  004F BANDWIDTH.COM CLEC, LLC - TX 566   2009-02-21   
830-255 8 Carrizo Springs TX SNANTX78GT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 566   2010-07-23   
830-255 9 Carrizo Springs TX SNANTX78GT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 566   2008-04-21   

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.