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: 972 [Rate centres in NPA 972] [Dial plan for NPA 972]

NXX: 576

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
972-576 A Red Oak TX RDOKTXHORS0  9533 SOUTHWESTERN BELL 552      
972-576 0 Red Oak TX RDOKTXHORS0  9533 SOUTHWESTERN BELL 552      
972-576 1 Red Oak TX RDOKTXHORS0  9533 SOUTHWESTERN BELL 552      
972-576 2 Red Oak TX RDOKTXHORS0  9533 SOUTHWESTERN BELL 552      
972-576 3 Red Oak TX RDOKTXHORS0  9533 SOUTHWESTERN BELL 552      
972-576 4 Red Oak TX RDOKTXHORS0  9533 SOUTHWESTERN BELL 552      
972-576 5 Red Oak TX RDOKTXHORS0  9533 SOUTHWESTERN BELL 552      
972-576 6 Red Oak TX FRBRTXBLGTA  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 552   2015-05-12   
972-576 7 Red Oak TX DLLSTX97DSS  177F PEERLESS NETWORK OF TEXAS, LLC - TX 552   2013-04-27   
972-576 8 Red Oak TX RDOKTXHORS0  9533 SOUTHWESTERN BELL 552      
972-576 9 Red Oak TX DLLSTX97DSS  177F PEERLESS NETWORK OF TEXAS, LLC - TX 552   2013-04-27   

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.