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.

Switch: DNVRCOMA39Z

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
303-284 A Denver CO 318J COMCAST IP PHONE, LLC 656      
303-353 A Denver CO 318J COMCAST IP PHONE, LLC 656      
303-498 A Denver CO 318J COMCAST IP PHONE, LLC 656      
303-862 A Denver CO 318J COMCAST IP PHONE, LLC 656      
303-945 A Denver CO 318J COMCAST IP PHONE, LLC 656      
303-997 A Denver CO 318J COMCAST IP PHONE, LLC 656      
303-999 A Denver CO 318J COMCAST IP PHONE, LLC 656      
720-287 A Denver CO 318J COMCAST IP PHONE, LLC 656      
720-324 A Denver CO 318J COMCAST IP PHONE, LLC 656      
720-328 A Denver CO 318J COMCAST IP PHONE, LLC 656      
720-381 A Denver CO 318J COMCAST IP PHONE, LLC 656      
720-410 A Denver CO 318J COMCAST IP PHONE, LLC 656      
720-485 A Denver CO 318J COMCAST IP PHONE, LLC 656      
720-502 A Denver CO 318J COMCAST IP PHONE, LLC 656      
720-510 A Denver CO 318J COMCAST IP PHONE, LLC 656      
720-512 A Denver CO 318J COMCAST IP PHONE, LLC 656      
720-531 A Denver CO 318J COMCAST IP PHONE, LLC 656      
720-638 A Denver CO 318J COMCAST IP PHONE, LLC 656      
720-667 A Denver CO 318J COMCAST IP PHONE, LLC 656      
720-674 A Denver CO 318J COMCAST IP PHONE, LLC 656      
720-726 A Denver CO 318J COMCAST IP PHONE, LLC 656      
720-815 A Longmont CO 318J COMCAST IP PHONE, LLC 656      
720-817 A Strasburg CO 318J COMCAST IP PHONE, LLC 656      
720-826 A Denver CO 318J COMCAST IP PHONE, LLC 656      
720-906 A Byers CO 318J COMCAST IP PHONE, LLC 656      
720-925 A Denver CO 318J COMCAST IP PHONE, LLC 656      
720-997 A Bennett CO 318J COMCAST IP PHONE, LLC 656      
720-998 A Denver CO 318J COMCAST IP PHONE, LLC 656      
970-232 A Fort Collins CO 318J COMCAST IP PHONE, LLC 656      
970-460 A Windsor CO 318J COMCAST IP PHONE, LLC 656      
970-504 A Carbondale CO 318J COMCAST IP PHONE, LLC 656      
970-561 A Windsor CO 318J COMCAST IP PHONE, LLC 656      
970-602 A Johnstown-Milliken CO 318J COMCAST IP PHONE, LLC 656      
970-657 A Fort Collins CO 318J COMCAST IP PHONE, LLC 656      
970-746 A Berthoud CO 318J COMCAST IP PHONE, LLC 656      
970-771 A Breckenridge CO 318J COMCAST IP PHONE, LLC 656      
970-855 A Edwards CO 318J COMCAST IP PHONE, LLC 656      
970-909 A Greeley CO 318J COMCAST IP PHONE, LLC 656      

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.