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.

Dallas, TX

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
972-581 6   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552      
972-581 7   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552      
972-581 8   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552   2010-06-03   
972-581 9   004F BANDWIDTH.COM CLEC, LLC - TX 552   2011-05-22   
972-584 A DLLSTXNODS0  9533 SOUTHWESTERN BELL 552      
972-584 0   6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552   2010-05-01   
972-584 1   6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552   2010-05-01   
972-584 2   9533 SOUTHWESTERN BELL 552      
972-584 3   9533 SOUTHWESTERN BELL 552      
972-584 4   9533 SOUTHWESTERN BELL 552      
972-584 5   9533 SOUTHWESTERN BELL 552      
972-584 6   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552   2012-01-30   
972-584 7   004F BANDWIDTH.COM CLEC, LLC - TX 552   2012-08-16   
972-584 8   9533 SOUTHWESTERN BELL 552      
972-584 9   6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552   2010-06-17   
972-587 A DLLBTXPVDS0  7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552      
972-587 0   004F BANDWIDTH.COM CLEC, LLC - TX 552   2011-05-22   
972-587 1   7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552      
972-587 2   829J PAETEC ITEL, LLC 552   2011-03-31   
972-587 3   7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552      
972-587 4   7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552      
972-587 5   7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552      
972-587 6   004F BANDWIDTH.COM CLEC, LLC - TX 552   2011-05-22   
972-587 7   004F BANDWIDTH.COM CLEC, LLC - TX 552   2010-08-26   
972-587 8   7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552      
972-587 9   004F BANDWIDTH.COM CLEC, LLC - TX 552   2011-05-22   
972-588 A DLLSTXREDS0  9533 SOUTHWESTERN BELL 552      
972-588 0   624H ONVOY SPECTRUM, LLC 552   2021-05-22   
972-588 1   9533 SOUTHWESTERN BELL 552      
972-588 2   9533 SOUTHWESTERN BELL 552      
972-588 3   9533 SOUTHWESTERN BELL 552      
972-588 4   004F BANDWIDTH.COM CLEC, LLC - TX 552   2010-08-26   
972-588 5   9533 SOUTHWESTERN BELL 552      
972-588 6   9533 SOUTHWESTERN BELL 552      
972-588 7   9533 SOUTHWESTERN BELL 552      
972-588 8   9533 SOUTHWESTERN BELL 552      
972-588 9   9533 SOUTHWESTERN BELL 552      
972-590 A DLLFTXFQDS1  7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 552      
972-590 0   7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 552      
972-590 1   7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 552      
972-590 2   7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 552      
972-590 3   7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 552      
972-590 4   7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 552      
972-590 5   7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 552      
972-590 6   004F BANDWIDTH.COM CLEC, LLC - TX 552   2011-05-22   
972-590 7   7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 552      
972-590 8   004F BANDWIDTH.COM CLEC, LLC - TX 552   2011-05-22   
972-590 9   7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 552      
972-591 A DLLSTXADDS0  9533 SOUTHWESTERN BELL 552      
972-591 0   6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552   2007-09-07   
972-591 1   6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552   2007-09-07   
972-591 2   6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552   2007-09-07   
972-591 3   6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552   2007-09-07   
972-591 4   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552   2008-11-10   
972-591 5   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552   2008-11-10   
972-591 6   004F BANDWIDTH.COM CLEC, LLC - TX 552   2010-08-26   
972-591 7   004F BANDWIDTH.COM CLEC, LLC - TX 552   2010-08-26   
972-591 8   004F BANDWIDTH.COM CLEC, LLC - TX 552   2010-08-26   
972-591 9   9533 SOUTHWESTERN BELL 552      
972-598 A   793K TWC IP ENABLED SERVICES, LLC 552      
972-598 0   793K TWC IP ENABLED SERVICES, LLC 552   2013-02-09   
972-598 1   793K TWC IP ENABLED SERVICES, LLC 552   2013-04-01   
972-598 2   5562 METROPCS, INC. 552   2013-03-06   
972-598 3   5562 METROPCS, INC. 552   2013-03-06   
972-598 4   5562 METROPCS, INC. 552   2013-03-06   
972-598 5   5562 METROPCS, INC. 552   2013-03-06   
972-598 6   9533 SOUTHWESTERN BELL 552   2013-04-08   
972-598 7   5562 METROPCS, INC. 552   2013-03-06   
972-598 8   9533 SOUTHWESTERN BELL 552   2013-04-26   
972-598 9   903C ONVOY, LLC - TX 552   2013-05-18   
972-613 A DLLSTXNMDS0  9533 SOUTHWESTERN BELL 552      
972-613 0   9533 SOUTHWESTERN BELL 552      
972-613 1   9533 SOUTHWESTERN BELL 552      
972-613 2   9533 SOUTHWESTERN BELL 552      
972-613 3   6529 T-MOBILE USA, INC. 552   2025-06-11   
972-613 4   9533 SOUTHWESTERN BELL 552      
972-613 5   9533 SOUTHWESTERN BELL 552      
972-613 6   9533 SOUTHWESTERN BELL 552      
972-613 7   9533 SOUTHWESTERN BELL 552      
972-613 8   9533 SOUTHWESTERN BELL 552      
972-613 9   9533 SOUTHWESTERN BELL 552      
972-616 A DLLFTXFQDS1  7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 552      
972-616 0   7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 552      
972-616 1   7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 552      
972-616 2   7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 552      
972-616 3   004F BANDWIDTH.COM CLEC, LLC - TX 552   2010-08-26   
972-616 4   004F BANDWIDTH.COM CLEC, LLC - TX 552   2011-05-22   
972-616 5   7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 552      
972-616 6   7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 552      
972-616 7   7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 552      
972-616 8   7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 552      
972-616 9   7516 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 552      
972-619 A DLLBTXPVDS0  7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552      
972-619 0   7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552      
972-619 1   7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552      
972-619 2   7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552      
972-619 3   004F BANDWIDTH.COM CLEC, LLC - TX 552   2011-05-22   
972-619 4   7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552      
972-619 5   004F BANDWIDTH.COM CLEC, LLC - TX 552   2011-05-22   
972-619 6   903C ONVOY, LLC - TX 552   2011-04-26   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 >>

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.