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: 970 [Rate centres in NPA 970] [Dial plan for NPA 970]

NXX: 236

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
970-236 A Aspen CO ASPECOMAGT0  588A ZIPPYTECH INCORPORATED 656      
970-236 0 Aspen CO   588A ZIPPYTECH INCORPORATED 656   2009-08-27   
970-236 1 Aspen CO   078F BANDWIDTH.COM CLEC, LLC - CO 656   2012-05-27   
970-236 2 Aspen CO   026D ONVOY, LLC - CO 656   2012-12-12   
970-236 3 Aspen CO   026D ONVOY, LLC - CO 656   2012-12-12   
970-236 4 Aspen CO   026D ONVOY, LLC - CO 656   2012-12-12   
970-236 5 Aspen CO   588A ZIPPYTECH INCORPORATED 656   2010-06-20   
970-236 6 Aspen CO   078F BANDWIDTH.COM CLEC, LLC - CO 656   2010-12-25   
970-236 7 Aspen CO   026D ONVOY, LLC - CO 656   2012-12-12   
970-236 8 Aspen CO   078F BANDWIDTH.COM CLEC, LLC - CO 656   2014-04-14   
970-236 9 Aspen CO   278F PEERLESS NETWORK OF COLORADO, LLC - CO 656   2012-10-27   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.