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.

Denver, CO

<< 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 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
720-563 A BLDRCOMADS0  9636 QWEST CORPORATION 656      
720-563 0 BLDRCOMADS0  9636 QWEST CORPORATION 656      
720-563 1 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2007-11-29   
720-563 2 DNVRCOCLDS0  9636 QWEST CORPORATION 656      
720-563 3 DNVRCOCLDS0  9636 QWEST CORPORATION 656      
720-563 4 DNVRCOCLDS0  9636 QWEST CORPORATION 656      
720-563 5 DNVRCOCLDS0  9636 QWEST CORPORATION 656      
720-563 6 DNVRCOCLDS0  9636 QWEST CORPORATION 656      
720-563 7 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2007-11-29   
720-563 8 LTTNCOHLDS0  9636 QWEST CORPORATION 656      
720-563 9 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2007-11-29   
720-564 A BLDRCOMADS0  9636 QWEST CORPORATION 656      
720-565 A BLDRCOMADS0  9636 QWEST CORPORATION 656      
720-566 A BRFDCOMADS0  9636 QWEST CORPORATION 656      
720-567 A DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
720-568 A ENWDCOABDS0  9636 QWEST CORPORATION 656      
720-568 0 DNVRCOII3MD  6529 T-MOBILE USA, INC. 656   2008-03-07   
720-568 1 ENWDCOABDS0  9636 QWEST CORPORATION 656      
720-568 2 ENWDCOABDS0  9636 QWEST CORPORATION 656      
720-568 3 ENWDCOABDS0  9636 QWEST CORPORATION 656      
720-568 4 ENWDCOABDS0  9636 QWEST CORPORATION 656      
720-568 5 DNVRCOMADS0  9636 QWEST CORPORATION 656      
720-568 6 DNVRCOMADS0  9636 QWEST CORPORATION 656      
720-568 7 NGLNCOMADS0  9636 QWEST CORPORATION 656      
720-568 8 DNVRCOSWDS0  9636 QWEST CORPORATION 656      
720-568 9 DNVRCOII3MD  6529 T-MOBILE USA, INC. 656   2008-03-07   
720-569 A DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656      
720-569 0 DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2008-11-22   
720-569 1 DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2008-11-22   
720-569 2 DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2008-11-22   
720-569 3 DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2008-11-22   
720-569 4 DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2008-11-22   
720-569 5 DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2008-11-22   
720-569 6 DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2008-11-22   
720-569 7 DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2008-11-22   
720-569 8 DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2008-11-22   
720-569 9 DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2008-11-22   
720-570 A DNVRCOSODS0  9636 QWEST CORPORATION 656      
720-570 0 DNVRCOSODS0  9636 QWEST CORPORATION 656      
720-570 1 DNVRCOSODS0  9636 QWEST CORPORATION 656      
720-570 2 DNVRCOSODS0  9636 QWEST CORPORATION 656      
720-570 3 DNVRCOSODS0  9636 QWEST CORPORATION 656      
720-570 4 DNVRCOSODS0  9636 QWEST CORPORATION 656      
720-570 5 DNVRCOSODS0  9636 QWEST CORPORATION 656      
720-570 6 DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2008-05-18   
720-570 7 DNVRCOSODS0  9636 QWEST CORPORATION 656      
720-570 8 DNVRCOSODS0  9636 QWEST CORPORATION 656      
720-570 9 DNVRCOSODS0  9636 QWEST CORPORATION 656      
720-572 A AURRCOBUDS0  7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656      
720-572 0 DNVRCOII3MD  5562 METROPCS, INC. 656   2017-03-31   
720-572 1 DNVRCO26XIX  073H TELNYX LLC 656   2017-03-23   
720-572 2 DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656   2017-02-28   
720-572 3 DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656   2017-01-31   
720-572 4 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2017-01-31   
720-572 5 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2017-01-31   
720-572 6 AURRCOBUDS0  7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656   2017-01-30   
720-572 7 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2017-01-31   
720-572 8 DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656   2017-03-02   
720-572 9 DNVRCOII3MD  5562 METROPCS, INC. 656   2017-07-12   
720-573 A AURSCOFWDS0  4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656      
720-573 0 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2014-12-04   
720-573 1 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2014-12-04   
720-573 2 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2014-12-04   
720-573 3 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2014-12-02   
720-573 4 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2015-01-08   
720-573 5 AURSCOFWDS0  4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656   2014-12-01   
720-573 6 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2015-03-13   
720-573 7 DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656   2015-02-18   
720-573 8 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2015-10-10   
720-573 9 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2015-03-13   
720-574 A DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656      
720-574 0 DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2018-08-31   
720-574 1 DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2018-08-31   
720-574 2 DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2018-08-31   
720-574 3 DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2018-08-31   
720-574 4 DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2018-09-24   
720-574 5 DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2018-09-24   
720-574 6 DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2018-09-24   
720-574 7 DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2018-09-24   
720-574 8 DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2018-09-24   
720-574 9 DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2018-09-24   
720-575 A DNVTCOZIDS1  026D ONVOY, LLC - CO 656      
720-575 0 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2015-01-10   
720-575 1 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2015-01-10   
720-575 2 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2015-01-10   
720-575 3 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2015-01-10   
720-575 4 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2015-01-10   
720-575 5 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2015-01-10   
720-575 6 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2015-01-10   
720-575 7 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2015-01-10   
720-575 8 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2015-01-10   
720-575 9 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2015-01-10   
720-576 A AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
720-576 0 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2016-12-24   
720-576 1 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2016-12-24   
720-576 2 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2016-12-24   
720-576 3 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2016-12-24   
720-576 4 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2016-12-24   
720-576 5 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2016-12-24   
720-576 6 AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2016-12-24   

<< 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 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 >>

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.