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.

Madison, WI

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
608-400 A MDSNWI11XAX  225C ONVOY, LLC - WI 354      
608-400 0   225C ONVOY, LLC - WI 354   2017-11-27   
608-400 1   6508 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 354   2019-04-15   
608-400 2   6508 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 354   2018-04-06   
608-400 3   6508 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 354   2018-04-06   
608-400 4   225C ONVOY, LLC - WI 354   2017-11-27   
608-400 5   6508 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 354   2018-12-17   
608-400 6   6508 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 354   2018-12-17   
608-400 7   6508 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 354   2018-12-17   
608-400 8   227F PEERLESS NETWORK OF WISCONSIN, LLC - WI 354   2020-03-04   
608-400 9   6508 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 354   2020-06-17   
608-405 A MDSRWIKE0MD  073H TELNYX LLC 354      
608-405 0   6508 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 354   2017-03-24   
608-405 1   073H TELNYX LLC 354   2017-01-26   
608-405 2   6508 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 354   2017-03-24   
608-405 3   792K CHARTER IP ENABLED SERVICES, LLC 354   2018-08-16   
608-405 4   7216 TELEPORT COMMUNICATIONS AMERICA, LLC WI 354   2019-11-25   
608-405 5   792K CHARTER IP ENABLED SERVICES, LLC 354   2018-01-21   
608-405 6   225C ONVOY, LLC - WI 354   2019-11-07   
608-405 7   5489 LEVEL 3 COMMUNICATIONS, LLC - WI 354   2017-03-24   
608-405 8   227F PEERLESS NETWORK OF WISCONSIN, LLC - WI 354   2017-06-03   
608-405 9   6508 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 354   2017-06-19   
608-416 A MDSNWI025MD  5489 LEVEL 3 COMMUNICATIONS, LLC - WI 354      
608-416 0   6508 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 354   2014-11-28   
608-416 1   5489 LEVEL 3 COMMUNICATIONS, LLC - WI 354   2015-08-21   
608-416 2   792K CHARTER IP ENABLED SERVICES, LLC 354   2016-04-06   
608-416 3   6508 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 354   2015-06-02   
608-416 4   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 354   2015-01-23   
608-416 5   792K CHARTER IP ENABLED SERVICES, LLC 354   2016-03-22   
608-416 6   5489 LEVEL 3 COMMUNICATIONS, LLC - WI 354   2014-11-24   
608-416 7   508J CENTURYLINK COMMUNICATIONS, LLC 354   2014-11-26   
608-416 8   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 354   2016-09-02   
608-416 9   6508 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 354   2015-07-05   
608-417 A MDSNWIUQDS0  7588 CENTURYLINK COMMUNICATIONS LLC - WI 354      
608-417 0   6508 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 354   2008-12-15   
608-417 1   7588 CENTURYLINK COMMUNICATIONS LLC - WI 354   2007-04-09   
608-417 2   7588 CENTURYLINK COMMUNICATIONS LLC - WI 354   2007-04-09   
608-417 3   7588 CENTURYLINK COMMUNICATIONS LLC - WI 354   2007-04-09   
608-417 4   7588 CENTURYLINK COMMUNICATIONS LLC - WI 354   2007-04-09   
608-417 5   7588 CENTURYLINK COMMUNICATIONS LLC - WI 354   2007-04-09   
608-417 6   7588 CENTURYLINK COMMUNICATIONS LLC - WI 354   2007-04-09   
608-417 7   7588 CENTURYLINK COMMUNICATIONS LLC - WI 354   2007-04-09   
608-417 8   7588 CENTURYLINK COMMUNICATIONS LLC - WI 354   2007-04-09   
608-417 9   6508 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 354   2008-12-15   
608-421 A MDSNWI11XYX  551G NUSO, LLC 354      
608-421 0   6529 T-MOBILE USA, INC. 354   2013-10-14   
608-421 1   551G NUSO, LLC 354   2013-05-08   
608-421 2   6529 T-MOBILE USA, INC. 354   2013-08-05   
608-421 3   6529 T-MOBILE USA, INC. 354   2013-08-05   
608-421 4   6529 T-MOBILE USA, INC. 354   2013-08-05   
608-421 5   7322 LEVEL 3 TELECOM OF WISCONSIN, LP - WI 354   2013-08-22   
608-421 6   7216 TELEPORT COMMUNICATIONS AMERICA, LLC WI 354   2013-09-09   
608-421 7   7216 TELEPORT COMMUNICATIONS AMERICA, LLC WI 354   2013-09-09   
608-421 8   6529 T-MOBILE USA, INC. 354   2013-10-14   
608-421 9   6529 T-MOBILE USA, INC. 354   2013-10-14   
608-422 A MDSNWIPU2MD  6274 UNITED STATES CELLULAR - WI 354      
608-422 0   6274 UNITED STATES CELLULAR - WI 354   2014-04-26   
608-422 1   6508 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 354   2015-09-05   
608-422 2   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 354   2014-08-22   
608-422 3   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 354   2014-08-26   
608-422 4   007F BANDWIDTH.COM CLEC, LLC - WI 354   2014-10-18   
608-422 5   516C AT&T CORP. 354   2014-07-31   
608-422 6   7588 CENTURYLINK COMMUNICATIONS LLC - WI 354   2014-09-03   
608-422 7   7588 CENTURYLINK COMMUNICATIONS LLC - WI 354   2014-09-03   
608-422 8   7216 TELEPORT COMMUNICATIONS AMERICA, LLC WI 354   2016-03-25   
608-422 9   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 354   2014-07-19   
608-438 A MDSNWIPU2MD  6274 UNITED STATES CELLULAR - WI 354      
608-440 A MDSNWI02ZMD  7216 TELEPORT COMMUNICATIONS AMERICA, LLC WI 354      
608-440 0   6508 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 354   2015-06-14   
608-440 1   6508 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 354   2015-12-31   
608-440 2   5489 LEVEL 3 COMMUNICATIONS, LLC - WI 354   2015-03-16   
608-440 3   6529 T-MOBILE USA, INC. 354   2015-09-13   
608-440 4   6529 T-MOBILE USA, INC. 354   2015-09-13   
608-440 5   6529 T-MOBILE USA, INC. 354   2015-09-13   
608-440 6   7216 TELEPORT COMMUNICATIONS AMERICA, LLC WI 354   2014-12-01   
608-440 7   508J CENTURYLINK COMMUNICATIONS, LLC 354   2015-06-08   
608-440 8   007F BANDWIDTH.COM CLEC, LLC - WI 354   2015-03-13   
608-440 9   007F BANDWIDTH.COM CLEC, LLC - WI 354   2015-03-13   
608-441 A   520K TDS METROCOM, LLC 354      
608-442 A   520K TDS METROCOM, LLC 354      
608-443 A   520K TDS METROCOM, LLC 354      
608-443 0   520K TDS METROCOM, LLC 354      
608-443 1   520K TDS METROCOM, LLC 354      
608-443 2   520K TDS METROCOM, LLC 354      
608-443 3   520K TDS METROCOM, LLC 354      
608-443 4   520K TDS METROCOM, LLC 354      
608-443 5   520K TDS METROCOM, LLC 354      
608-443 6   6529 T-MOBILE USA, INC. 354   2005-10-08   
608-443 7   6529 T-MOBILE USA, INC. 354   2006-01-09   
608-443 8   6529 T-MOBILE USA, INC. 354   2005-03-19   
608-443 9   6529 T-MOBILE USA, INC. 354   2005-01-18   
608-444 A MDSNWIPU2MD  6274 UNITED STATES CELLULAR - WI 354      
608-445 A MDSNWIPU2MD  6274 UNITED STATES CELLULAR - WI 354      
608-446 A   520K TDS METROCOM, LLC 354      
608-458 A MDSNWI12DS0  9327 WISCONSIN BELL INC 354      
608-467 A MDSNWI025MD  5489 LEVEL 3 COMMUNICATIONS, LLC - WI 354      
608-467 0   5489 LEVEL 3 COMMUNICATIONS, LLC - WI 354   2005-01-26   
608-467 1   5489 LEVEL 3 COMMUNICATIONS, LLC - WI 354   2005-02-17   
608-467 2   792K CHARTER IP ENABLED SERVICES, LLC 354   2006-08-09   
608-467 3   792K CHARTER IP ENABLED SERVICES, LLC 354   2012-07-01   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 >>

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.