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
720-271 A DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
720-271 0   6529 T-MOBILE USA, INC. 656      
720-271 1   6529 T-MOBILE USA, INC. 656      
720-271 2   6529 T-MOBILE USA, INC. 656      
720-271 3   026D ONVOY, LLC - CO 656   2007-06-23   
720-271 4   6010 NEW CINGULAR WIRELESS PCS, LLC 656   2007-11-09   
720-271 5   6529 T-MOBILE USA, INC. 656      
720-271 6   6529 T-MOBILE USA, INC. 656      
720-271 7   6529 T-MOBILE USA, INC. 656      
720-271 8   6529 T-MOBILE USA, INC. 656      
720-271 9   6529 T-MOBILE USA, INC. 656      
720-272 A DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656      
720-273 A DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656      
720-274 A DNVTCOUZ0MD  829J PAETEC ITEL, LLC 656      
720-275 A DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656      
720-276 A DNVRCOMD4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 656      
720-277 A DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
720-277 0   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
720-277 1   6529 T-MOBILE USA, INC. 656   2005-02-04   
720-277 2   6529 T-MOBILE USA, INC. 656   2005-02-04   
720-277 3   318J COMCAST IP PHONE, LLC 656   2002-12-16   
720-277 4   6529 T-MOBILE USA, INC. 656   2009-10-23   
720-277 5   6529 T-MOBILE USA, INC. 656   2003-12-14   
720-277 6   6529 T-MOBILE USA, INC. 656   2003-12-14   
720-277 7   6529 T-MOBILE USA, INC. 656   2005-03-18   
720-277 8   6529 T-MOBILE USA, INC. 656   2005-03-18   
720-277 9   078F BANDWIDTH.COM CLEC, LLC - CO 656   2010-02-19   
720-278 A AURSCOFWDS0  4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656      
720-278 0   6529 T-MOBILE USA, INC. 656   2006-09-16   
720-278 1   6529 T-MOBILE USA, INC. 656   2005-05-09   
720-278 2   4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656      
720-278 3   6529 T-MOBILE USA, INC. 656   2006-09-16   
720-278 4   6529 T-MOBILE USA, INC. 656   2006-11-02   
720-278 5   6529 T-MOBILE USA, INC. 656   2006-11-02   
720-278 6   6529 T-MOBILE USA, INC. 656   2006-11-02   
720-278 7   026D ONVOY, LLC - CO 656   2007-04-30   
720-278 8   6529 T-MOBILE USA, INC. 656   2007-04-02   
720-278 9   6529 T-MOBILE USA, INC. 656   2007-03-09   
720-279 A AURSCOFWDS0  4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656      
720-279 0   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2006-11-12   
720-279 1   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2006-11-12   
720-279 2   4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656      
720-279 3   4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656      
720-279 4   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2006-11-12   
720-279 5   4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656      
720-279 6   4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656   2002-07-09   
720-279 7   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2006-11-12   
720-279 8   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2006-11-12   
720-279 9   6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2006-11-12   
720-280 A DNVRCOII3MD  6529 T-MOBILE USA, INC. 656      
720-281 A AURRCO20AMD  6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
720-281 0   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
720-281 1   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
720-281 2   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2004-09-15   
720-281 3   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2004-09-15   
720-281 4   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2004-09-15   
720-281 5   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656      
720-281 6   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2009-09-13   
720-281 7   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2008-01-19   
720-281 8   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2008-01-19   
720-281 9   078F BANDWIDTH.COM CLEC, LLC - CO 656   2008-11-20   
720-282 A AURSCOFWDS0  4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656      
720-282 0   026D ONVOY, LLC - CO 656   2006-02-05   
720-282 1   078F BANDWIDTH.COM CLEC, LLC - CO 656   2010-11-15   
720-282 2   4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656      
720-282 3   318J COMCAST IP PHONE, LLC 656   2002-12-16   
720-282 4   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656   2009-02-23   
720-282 5   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656   2009-02-23   
720-282 6   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656   2009-02-23   
720-282 7   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656   2009-02-23   
720-282 8   4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656   2010-05-22   
720-282 9   078F BANDWIDTH.COM CLEC, LLC - CO 656   2011-04-29   
720-283 A LTTNCOMADS0  9636 QWEST CORPORATION 656      
720-284 A DNVRCO37DS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-284 0   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-284 1   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2004-03-24   
720-284 2   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2004-03-24   
720-284 3   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-284 4   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2004-03-24   
720-284 5   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-284 6   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-284 7   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2004-03-24   
720-284 8   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2004-03-24   
720-284 9   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2004-03-24   
720-285 A ENWDCO47DS3  8980 XO COLORADO, LLC 656      
720-285 0   6529 T-MOBILE USA, INC. 656   2009-07-17   
720-285 1   8980 XO COLORADO, LLC 656   2009-03-30   
720-285 2   8980 XO COLORADO, LLC 656   2009-03-30   
720-285 3   8980 XO COLORADO, LLC 656   2009-03-30   
720-285 4   8980 XO COLORADO, LLC 656   2009-03-30   
720-285 5   6529 T-MOBILE USA, INC. 656   2009-07-17   
720-285 6   6529 T-MOBILE USA, INC. 656   2009-07-17   
720-285 7   6529 T-MOBILE USA, INC. 656   2009-07-17   
720-285 8   6529 T-MOBILE USA, INC. 656   2009-07-17   
720-285 9   6529 T-MOBILE USA, INC. 656   2009-07-17   
720-286 A DNVRCOMDDS1  7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656      
720-286 0   7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656   2002-06-22   
720-286 1   7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656   2002-06-22   
720-286 2   7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656   2002-06-22   
720-286 3   7378 TELEPORT COMMUNICATIONS AMERICA, LLC - CO 656   2002-06-22   

<< 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.