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.

OCN: 5972 INTERLINK ADV SVC DBA FORETHOUGHT.NET - CO

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
303-815 A Denver CO DNVRCO03DS1  656      
303-815 1 Denver CO DNVRCO03DS1  656   2004-05-06   
303-872 2 Denver CO DNVRCO03DS1  656   2005-01-13   
303-945 2 Denver CO DNVRCO03DS1  656   2006-12-08   
719-922 A Colorado Springs-Main CO CLSPCOMAXCY  658      
719-922 8 Colorado Springs-Main CO CLSPCOMAXCY  658   2018-06-08   
720-420 3 Denver CO DNVRCO03DS1  656   2010-07-29   
720-420 4 Denver CO DNVRCO03DS1  656   2010-07-29   
720-420 5 Denver CO DNVRCO03DS1  656   2010-07-29   
970-230 8 Glenwood Springs CO DNVRCO03DS1  656   2014-08-07   
970-294 0 Fort Collins CO DNVRCO03DS1  656   2014-08-07   
970-341 0 Olathe CO GDJTCOMAPMD  656   2016-10-02   
970-431 1 Gypsum CO DNVRCO03DS1  656   2017-04-09   
970-432 5 Eagle CO DNVRCO03DS1  656   2017-04-09   
970-445 9 Vail CO DNVRCO03DS1  656   2014-08-07   
970-452 5 Aspen CO DNVRCO03DS1  656   2017-04-04   
970-459 8 Durango CO DURNCOMA7MD  656   2014-04-20   
970-519 4 Telluride CO GDJTCOMAPMD  656   2017-02-25   
970-527 9 Paonia CO GDJTCOMAPMD  656   2016-11-05   
970-546 1 Delta CO GDJTCOMAPMD  656   2016-10-14   
970-678 A Basalt CO DNVRCO03DS1  656      
970-678 5 Basalt CO DNVRCO03DS1  656   2017-05-08   
970-697 A Grand Junction CO GDJTCOMAPMD  656      
970-697 2 Grand Junction CO GDJTCOMAPMD  656   2014-05-23   
970-787 9 Montrose CO GDJTCOMAPMD  656   2016-10-02   
970-835 6 Eckert CO GDJTCOMAPMD  656   2016-11-05   
970-855 5 Edwards CO DNVRCO03DS1  656   2017-04-09   
970-856 9 Cedaredge CO GDJTCOMAPMD  656   2016-11-05   
970-872 9 Hotchkiss CO GDJTCOMAPMD  656   2016-11-05   
970-919 8 Silverton CO GDJTCOMAPMD  656   2016-06-20   
970-921 1 Crawford CO GDJTCOMAPMD  656   2016-11-05   

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.