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 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
972-638 2 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-638 3 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-638 4 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-638 5 DLLSTXHM0MD  829J PAETEC ITEL, LLC 552   2010-09-20   
972-638 6 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-638 7 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2010-10-28   
972-638 8 DLLATX37DS6  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552   2011-01-15   
972-638 9 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2012-08-16   
972-643 A DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-643 0 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-643 1 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-643 2 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-643 3 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-643 4 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-643 5 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-643 6 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-643 7 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-643 8 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2012-08-16   
972-643 9 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-644 A DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-656 A DLLSTXJFDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552      
972-656 0 DLLSTXALDS4  903C ONVOY, LLC - TX 552   2011-07-21   
972-656 1 DLLSTXALDS4  903C ONVOY, LLC - TX 552   2011-07-21   
972-656 2 DLLSTXJFDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552      
972-656 3 DLLSTXJFDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552      
972-656 4 DLLSTXJFDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552   2010-08-24   
972-656 5 DLLSTXJFDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552   2010-08-24   
972-656 6 DLLSTXJFDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552   2008-12-18   
972-656 7 DLLSTXJFDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552   2008-12-18   
972-656 8 DLLSTXJFDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552   2008-12-18   
972-656 9 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2012-08-16   
972-661 A DLLSTXADDS1  9533 SOUTHWESTERN BELL 552      
972-663 A DLLSTXADDS1  9533 SOUTHWESTERN BELL 552      
972-663 0 DLLSTXTAXTZ  624H ONVOY SPECTRUM, LLC 552   2021-05-22   
972-663 1 DLLSTXADDS1  9533 SOUTHWESTERN BELL 552      
972-663 2 DLLSTXADDS1  9533 SOUTHWESTERN BELL 552      
972-663 3 DLLSTXADDS1  9533 SOUTHWESTERN BELL 552      
972-663 4 DLLSTXADDS1  9533 SOUTHWESTERN BELL 552      
972-663 5 DLLSTXALDS4  903C ONVOY, LLC - TX 552   2011-08-03   
972-663 6 DLLSTXADDS1  9533 SOUTHWESTERN BELL 552      
972-663 7 DLLSTXADDS1  9533 SOUTHWESTERN BELL 552      
972-663 8 DLLSTXADDS1  9533 SOUTHWESTERN BELL 552      
972-663 9 DLLSTXADDS1  9533 SOUTHWESTERN BELL 552      
972-664 A DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-664 0 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-664 1 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-664 2 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-664 3 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-664 4 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2010-10-28   
972-664 5 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-664 6 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-664 7 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-664 8 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-664 9 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-669 A DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-671 A DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-671 0 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-671 1   6529 T-MOBILE USA, INC. 552   2025-05-12   
972-671 2 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-671 3 DLLSTXTAXTZ  624H ONVOY SPECTRUM, LLC 552   2021-12-19   
972-671 4 DLLSTXTAXTZ  624H ONVOY SPECTRUM, LLC 552   2021-12-19   
972-671 5 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-671 6 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-671 7 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-671 8 DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      
972-671 9   6529 T-MOBILE USA, INC. 552   2025-05-12   
972-674 A DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552      
972-674 0 DLLTTXID1MD  5562 METROPCS, INC. 552   2011-03-24   
972-674 1 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2010-10-28   
972-674 2 DLLSTXJFPS1  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552   2009-12-18   
972-674 3 DLLSTXJFPS1  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552   2009-12-18   
972-674 4 DLLSTXJFPS1  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552   2009-12-18   
972-674 5 DLLSTXJFPS1  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552   2009-12-18   
972-674 6 DLLTTXID1MD  5562 METROPCS, INC. 552   2011-03-24   
972-674 7 DLLTTXID1MD  5562 METROPCS, INC. 552   2011-03-24   
972-674 8 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2010-10-28   
972-674 9 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2012-08-16   
972-676 A DLLSTXJFPS1  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552      
972-676 0 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2010-04-08   
972-676 1 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2010-04-08   
972-676 2 DLLSTXJFPS1  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552      
972-676 3 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2010-04-08   
972-676 4 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2010-04-08   
972-676 5 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2010-04-08   
972-676 6 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2010-04-08   
972-676 7 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2010-04-08   
972-676 8 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2010-04-08   
972-676 9 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2010-04-08   
972-677 A DLLBTXPVDS0  7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552      
972-677 0 DLLBTXPVDS0  7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552      
972-677 1 DLLBTXPVDS0  7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552      
972-677 2 DLLBTXPVDS0  7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552      
972-677 3 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2010-10-28   
972-677 4 DLLBTXPVDS0  7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552      
972-677 5 DLLBTXPVDS0  7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552      
972-677 6 DLLBTXPVDS0  7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552      
972-677 7   793K TWC IP ENABLED SERVICES, LLC 552      
972-677 8 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2018-07-15   
972-677 9 DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2018-07-15   
972-680 A DLLSTXRNDS0  9533 SOUTHWESTERN BELL 552      

<< 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 >>

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.