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: 437

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
972-437 A Dallas TX DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-437 0 Dallas TX DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-437 1 Dallas TX DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-437 2 Dallas TX DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-437 3 Dallas TX DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-437 4 Dallas TX DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-437 5 Dallas TX DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-437 6 Dallas TX DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-437 7 Dallas TX DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-437 8 Dallas TX DLLATX37DS6  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552      
972-437 9 Dallas TX DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.