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 91 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
720-710 9   318J COMCAST IP PHONE, LLC 656   2016-12-02   
720-716 A DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
720-716 0   5562 METROPCS, INC. 656   2021-01-23   
720-716 1   5562 METROPCS, INC. 656   2021-01-23   
720-716 2   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2020-05-25   
720-716 3   318J COMCAST IP PHONE, LLC 656   2020-05-26   
720-716 4   318J COMCAST IP PHONE, LLC 656   2020-05-26   
720-716 5   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2020-05-26   
720-716 6   321J HD CARRIER LLC 656   2020-05-26   
720-716 7   321J HD CARRIER LLC 656   2020-05-26   
720-716 8   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2021-01-23   
720-716 9   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2020-05-26   
720-717 A DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656      
720-717 0   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2015-05-07   
720-717 1   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-05-20   
720-717 2   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-05-20   
720-717 3   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-05-20   
720-717 4   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-05-20   
720-717 5   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-07-22   
720-717 6   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-07-22   
720-717 7   508J CENTURYLINK COMMUNICATIONS, LLC 656   2015-05-23   
720-717 8   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-04-17   
720-717 9   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-04-17   
720-719 A DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2024-06-07   
720-719 0   078F BANDWIDTH.COM CLEC, LLC - CO 656   2024-06-07   
720-719 1   078F BANDWIDTH.COM CLEC, LLC - CO 656   2024-06-07   
720-719 2   078F BANDWIDTH.COM CLEC, LLC - CO 656   2024-06-07   
720-719 3   078F BANDWIDTH.COM CLEC, LLC - CO 656   2024-06-07   
720-719 4   732J NUSO, LLC 656   2024-08-02   
720-719 5   026D ONVOY, LLC - CO 656   2024-06-08   
720-719 6   026D ONVOY, LLC - CO 656   2024-06-08   
720-719 7   026D ONVOY, LLC - CO 656   2024-06-08   
720-719 8   026D ONVOY, LLC - CO 656   2024-06-08   
720-719 9   026D ONVOY, LLC - CO 656   2024-06-08   
720-720 A DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656   2024-10-18   
720-720 0   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2024-10-18   
720-720 1   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2024-10-18   
720-720 2   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2024-10-18   
720-720 3   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2024-10-18   
720-720 4   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2024-10-18   
720-720 5   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2024-10-18   
720-720 6   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2024-10-18   
720-720 7   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2024-10-18   
720-720 8   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2024-10-18   
720-720 9   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2024-10-18   
720-721 A DNVRCOMA37Z  507J THE VOICE APPLICATION NETWORK, LLC 656      
720-721 0   321J HD CARRIER LLC 656   2016-06-12   
720-721 1   507J THE VOICE APPLICATION NETWORK, LLC 656   2016-06-12   
720-721 2   321J HD CARRIER LLC 656   2016-06-12   
720-721 3   078F BANDWIDTH.COM CLEC, LLC - CO 656   2016-08-15   
720-721 4   321J HD CARRIER LLC 656   2016-09-01   
720-721 5   321J HD CARRIER LLC 656   2016-09-01   
720-721 6   321J HD CARRIER LLC 656   2016-09-01   
720-721 7   321J HD CARRIER LLC 656   2016-06-12   
720-721 8   321J HD CARRIER LLC 656   2016-09-01   
720-721 9   321J HD CARRIER LLC 656   2016-09-01   
720-722 A HLRNCOFP1MD  508J CENTURYLINK COMMUNICATIONS, LLC 656      
720-722 0   078F BANDWIDTH.COM CLEC, LLC - CO 656   2010-07-10   
720-722 1   078F BANDWIDTH.COM CLEC, LLC - CO 656   2010-07-10   
720-722 2   078F BANDWIDTH.COM CLEC, LLC - CO 656   2010-07-10   
720-722 3   078F BANDWIDTH.COM CLEC, LLC - CO 656   2010-07-10   
720-722 4   078F BANDWIDTH.COM CLEC, LLC - CO 656   2010-07-10   
720-722 5   078F BANDWIDTH.COM CLEC, LLC - CO 656   2010-07-10   
720-722 6   078F BANDWIDTH.COM CLEC, LLC - CO 656   2010-07-10   
720-722 7   508J CENTURYLINK COMMUNICATIONS, LLC 656   2010-06-30   
720-722 8   078F BANDWIDTH.COM CLEC, LLC - CO 656   2010-07-10   
720-722 9   078F BANDWIDTH.COM CLEC, LLC - CO 656   2010-07-10   
720-723 A DNVRCOETPS0  3467 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 656      
720-723 0   6529 T-MOBILE USA, INC. 656   2013-04-09   
720-723 1   6529 T-MOBILE USA, INC. 656   2013-04-09   
720-723 2   3467 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 656   2013-04-16   
720-723 3   3467 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 656   2013-03-21   
720-723 4   3467 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 656   2013-03-21   
720-723 5   3467 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 656   2013-03-21   
720-723 6   3467 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 656   2013-03-21   
720-723 7   3467 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 656   2013-03-21   
720-723 8   6529 T-MOBILE USA, INC. 656   2013-04-09   
720-723 9   5562 METROPCS, INC. 656   2013-12-25   
720-724 A DNVRCOETPS0  3467 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 656      
720-724 0   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2013-06-09   
720-724 1   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2013-06-09   
720-724 2   3467 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 656   2013-05-31   
720-724 3   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2013-06-27   
720-724 4   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2013-06-27   
720-724 5   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2013-07-08   
720-724 6   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2013-07-08   
720-724 7   078F BANDWIDTH.COM CLEC, LLC - CO 656   2013-06-21   
720-724 8   078F BANDWIDTH.COM CLEC, LLC - CO 656   2013-06-21   
720-724 9   078F BANDWIDTH.COM CLEC, LLC - CO 656   2013-06-21   
720-725 A DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
720-725 0   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-08-08   
720-725 1   6529 T-MOBILE USA, INC. 656   2015-08-07   
720-725 2   6529 T-MOBILE USA, INC. 656   2015-08-07   
720-725 3   6529 T-MOBILE USA, INC. 656   2015-08-07   
720-725 4   6529 T-MOBILE USA, INC. 656   2015-08-07   
720-725 5   6529 T-MOBILE USA, INC. 656   2015-08-07   
720-725 6   6529 T-MOBILE USA, INC. 656   2015-08-07   
720-725 7   6529 T-MOBILE USA, INC. 656   2015-08-07   
720-725 8   6529 T-MOBILE USA, INC. 656   2015-08-07   
720-725 9   6529 T-MOBILE USA, INC. 656   2015-08-07   

<< 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 91 >>

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.