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: 528

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
970-528 A Berthoud CO DNVRCO26DS5  278F PEERLESS NETWORK OF COLORADO, LLC - CO 656      
970-528 0 Berthoud CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2014-10-20   
970-528 1 Berthoud CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2015-10-02   
970-528 2 Berthoud CO DNVRCO26DS5  278F PEERLESS NETWORK OF COLORADO, LLC - CO 656   2013-06-01   
970-528 3 Berthoud CO DNVRCO26DS5  278F PEERLESS NETWORK OF COLORADO, LLC - CO 656   2013-06-01   
970-528 4 Berthoud CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2016-04-15   
970-528 5 Berthoud CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2016-04-15   
970-528 6 Berthoud CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2016-04-23   
970-528 7 Berthoud CO HLRNCOFP1MD  508J CENTURYLINK COMMUNICATIONS, LLC 656   2014-05-23   
970-528 8 Berthoud CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2016-04-23   
970-528 9 Berthoud CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2016-07-15   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.