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
720-643 5   318J COMCAST IP PHONE, LLC 656   2015-10-16   
720-643 6   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-10-16   
720-643 7   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-10-16   
720-643 8   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-10-16   
720-643 9   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-10-16   
720-644 A DNVTCOUZ0MD  829J PAETEC ITEL, LLC 656      
720-644 0   078F BANDWIDTH.COM CLEC, LLC - CO 656   2011-06-03   
720-644 1   078F BANDWIDTH.COM CLEC, LLC - CO 656   2011-06-03   
720-644 2   829J PAETEC ITEL, LLC 656   2011-06-03   
720-644 3   829J PAETEC ITEL, LLC 656   2011-06-02   
720-644 4   829J PAETEC ITEL, LLC 656   2011-06-02   
720-644 5   829J PAETEC ITEL, LLC 656   2011-06-02   
720-644 6   078F BANDWIDTH.COM CLEC, LLC - CO 656   2011-06-03   
720-644 7   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2011-08-17   
720-644 8   078F BANDWIDTH.COM CLEC, LLC - CO 656   2011-06-03   
720-644 9   078F BANDWIDTH.COM CLEC, LLC - CO 656   2011-06-03   
720-645 A DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
720-645 0   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2014-05-06   
720-645 1   318J COMCAST IP PHONE, LLC 656   2014-05-14   
720-645 2   318J COMCAST IP PHONE, LLC 656   2014-05-14   
720-645 3   6529 T-MOBILE USA, INC. 656   2014-05-04   
720-645 4   6529 T-MOBILE USA, INC. 656   2014-05-04   
720-645 5   6529 T-MOBILE USA, INC. 656   2014-05-04   
720-645 6   6529 T-MOBILE USA, INC. 656   2014-05-04   
720-645 7   6529 T-MOBILE USA, INC. 656   2014-05-04   
720-645 8   6529 T-MOBILE USA, INC. 656   2014-05-04   
720-645 9   6529 T-MOBILE USA, INC. 656   2014-05-04   
720-646 A DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656      
720-646 0   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2015-11-22   
720-646 1   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2015-11-22   
720-646 2   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2015-11-22   
720-646 3   4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656   2015-11-22   
720-646 4   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-11-21   
720-646 5   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-11-21   
720-646 6   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-11-21   
720-646 7   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-11-21   
720-646 8   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-11-21   
720-646 9   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2015-11-21   
720-647 A DNVTCOZIDS1  026D ONVOY, LLC - CO 656      
720-647 0   026D ONVOY, LLC - CO 656   2019-07-18   
720-647 1   026D ONVOY, LLC - CO 656   2019-07-18   
720-647 2   026D ONVOY, LLC - CO 656   2019-07-18   
720-647 3   026D ONVOY, LLC - CO 656   2019-07-18   
720-647 4   026D ONVOY, LLC - CO 656   2019-07-18   
720-647 5   078F BANDWIDTH.COM CLEC, LLC - CO 656   2019-07-19   
720-647 6   078F BANDWIDTH.COM CLEC, LLC - CO 656   2019-07-19   
720-647 7   078F BANDWIDTH.COM CLEC, LLC - CO 656   2019-07-19   
720-647 8   078F BANDWIDTH.COM CLEC, LLC - CO 656   2019-07-19   
720-647 9   078F BANDWIDTH.COM CLEC, LLC - CO 656   2019-07-19   
720-648 A AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
720-648 0   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2011-07-08   
720-648 1   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2011-07-08   
720-648 2   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2011-07-08   
720-648 3   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2011-07-08   
720-648 4   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2011-07-11   
720-648 5   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2011-07-11   
720-648 6   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2011-07-11   
720-648 7   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2011-07-11   
720-648 8   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2011-07-11   
720-648 9   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2011-07-11   
720-650 A DNVTCOZIDS1  026D ONVOY, LLC - CO 656      
720-650 0   026D ONVOY, LLC - CO 656   2017-10-16   
720-650 1   026D ONVOY, LLC - CO 656   2017-10-16   
720-650 2   026D ONVOY, LLC - CO 656   2017-10-16   
720-650 3   026D ONVOY, LLC - CO 656   2017-10-16   
720-650 4   026D ONVOY, LLC - CO 656   2017-10-16   
720-650 5   026D ONVOY, LLC - CO 656   2017-10-16   
720-650 6   026D ONVOY, LLC - CO 656   2017-10-16   
720-650 7   026D ONVOY, LLC - CO 656   2017-10-16   
720-650 8   026D ONVOY, LLC - CO 656   2017-10-16   
720-650 9   5562 METROPCS, INC. 656   2017-10-17   
720-651 A AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
720-651 0   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2015-11-29   
720-651 1   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2015-11-29   
720-651 2   6529 T-MOBILE USA, INC. 656   2016-08-11   
720-651 3   6529 T-MOBILE USA, INC. 656   2016-08-11   
720-651 4   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656   2017-04-30   
720-651 5   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656   2017-04-30   
720-651 6   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656   2017-04-30   
720-651 7   5562 METROPCS, INC. 656   2017-04-30   
720-651 8   078F BANDWIDTH.COM CLEC, LLC - CO 656   2016-08-15   
720-651 9   078F BANDWIDTH.COM CLEC, LLC - CO 656   2016-08-15   
720-653 A AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
720-653 0   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2019-07-18   
720-653 1   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2019-07-18   
720-653 2   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2019-07-18   
720-653 3   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2020-03-10   
720-653 4   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2020-04-13   
720-653 5   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2020-04-13   
720-653 6   5562 METROPCS, INC. 656   2021-01-13   
720-653 7   5562 METROPCS, INC. 656   2021-01-13   
720-653 8   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2020-06-15   
720-653 9   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2021-07-11   
720-654 A DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656      
720-654 0   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2022-02-24   
720-654 1   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2022-02-24   
720-654 2   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2022-02-24   
720-654 3   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2022-02-24   
720-654 4   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2022-02-24   
720-654 5   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2022-02-24   

<< 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 91 >>

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.