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.

Crandall EMS, TX

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
972-427 A DLLSTXSEDS0  9533 SOUTHWESTERN BELL 552      
972-427 0 DLLSTXSEDS0  9533 SOUTHWESTERN BELL 552      
972-427 1 DLLSTX97DSS  177F PEERLESS NETWORK OF TEXAS, LLC - TX 552   2013-04-21   
972-427 2 DLLSTXALDS4  903C ONVOY, LLC - TX 552   2013-12-09   
972-427 3 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2015-06-28   
972-427 4 DLLSTXJFDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552   2003-07-16   
972-427 5 DLLSTXALDS4  903C ONVOY, LLC - TX 552   2006-07-03   
972-427 6 DLLSTXSEDS0  9533 SOUTHWESTERN BELL 552      
972-427 7 DLLSTXALDS4  903C ONVOY, LLC - TX 552   2013-12-09   
972-427 8 DLLSTXSEDS0  9533 SOUTHWESTERN BELL 552      
972-427 9 DLLSTXSEDS0  9533 SOUTHWESTERN BELL 552      

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.