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: 330B FASTTRACK COMMUNICATIONS, INC. - CO

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
720-537 A Denver CO DURNCOBSDS0  656      
720-537 3 Denver CO   656   2014-12-18   
970-200 1 Grand Junction CO   656   2019-09-22   
970-208 9 Grand Junction CO   656   2006-06-05   
970-341 A Olathe CO DURNCOBSDS0  656      
970-341 6 Olathe CO   656   2014-02-23   
970-369 2 Telluride CO   656   2008-04-21   
970-387 3 Silverton CO   656   2008-07-05   
970-399 A Delta CO DURNCOBSDS0  656      
970-399 4 Delta CO   656   2008-04-21   
970-442 6 Ignacio CO   656   2013-06-23   
970-444 A Bayfield CO DURNCOBSDS0  656      
970-444 0 Bayfield CO   656   2006-06-05   
970-478 4 Norwood CO   656   2011-12-05   
970-497 5 Montrose CO   656   2006-06-05   
970-510 4 Carbondale CO   656   2010-06-03   
970-529 2 Cortez CO   656   2006-06-05   
970-533 5 Mancos CO   656   2008-05-24   
970-585 A Pagosa Springs CO DURNCOBSDS0  656      
970-585 0 Pagosa Springs CO   656      
970-585 1 Pagosa Springs CO   656      
970-585 2 Pagosa Springs CO   656      
970-585 3 Pagosa Springs CO   656      
970-633 7 Ouray CO   656   2014-04-27   
970-639 3 Fruita CO   656   2008-07-05   
970-648 7 Gunnison CO   656   2012-03-08   
970-676 5 Dolores CO   656   2015-06-18   
970-693 6 Meeker CO   656   2015-07-16   
970-714 7 Greeley CO   656   2015-01-02   
970-826 8 Craig CO   656   2011-12-05   
970-828 A Durango CO DURNCOBSDS0  656      

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.