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: 733

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
970-733 A Dolores CO DNVRCO26XUX  516J TON80 COMMUNICATIONS, LLC 656      
970-733 0 Dolores CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2023-07-24   
970-733 1 Dolores CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2025-01-23   
970-733 3 Dolores CO DNVRCO26XUX  516J TON80 COMMUNICATIONS, LLC 656   2022-04-18   
970-733 6 Dolores CO DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2023-03-05   
970-733 7 Dolores CO   145J TERRA NOVA TELECOM INC. 656   2025-06-11   
970-733 8 Dolores CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2022-04-19   

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.