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.

NPA: 720 [Rate centres in NPA 720] [Dial plan for NPA 720]

NXX: 458

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
720-458 A Denver CO AURSCOFWDS0  4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656      
720-458 0 Denver CO DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656      
720-458 1 Denver CO DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
720-458 2 Denver CO AURSCOFWDS0  4574 LEVEL 3 TELECOM OF COLORADO, LLC - CO 656      
720-458 3 Denver CO   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-458 4 Denver CO   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-458 5 Denver CO   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-458 6 Denver CO   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-458 7 Denver CO   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 656      
720-458 8 Denver CO DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      
720-458 9 Denver CO DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.