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: 512 [Rate centres in NPA 512] [Dial plan for NPA 512]

NXX: 551

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
512-551 A Austin TX AUSTTXUHZMD  8489 GLOBAL CROSSING LOCAL SERVICES, INC. - TX 558      
512-551 0 Austin TX AUSTTXUH5MD  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 558      
512-551 1 Austin TX AUSTTXUH5MD  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 558      
512-551 2 Austin TX AUSTTXGR25Z  516C AT&T CORP. 558      
512-551 3 Austin TX AUSTTXGR25Z  516C AT&T CORP. 558      
512-551 4 Austin TX AUSTTXUHZMD  8489 GLOBAL CROSSING LOCAL SERVICES, INC. - TX 558      
512-551 5 Austin TX AUSWTXSZDS2  7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 558      
512-551 6 Austin TX AUSWTXSZDS2  7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 558      
512-551 7 Austin TX AUSWTXSZDS2  7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 558      
512-551 8 Austin TX AUSTTXGR25Z  516C AT&T CORP. 558      
512-551 9 Austin TX AUSTTXGR25Z  516C AT&T CORP. 558      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.