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: 720 [Rate centres in NPA 720] [Dial plan for NPA 720]

NXX: 823

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
720-823 A Denver CO DNVRCOMA38Z  553J WHITESKY COMMUNICATIONS, LLC 656      
720-823 0 Denver CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2021-08-25   
720-823 1 Denver CO DNVRCOMA38Z  553J WHITESKY COMMUNICATIONS, LLC 656   2021-03-11   
720-823 2 Denver CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2021-03-12   
720-823 3 Denver CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2021-03-12   
720-823 4 Denver CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2021-03-12   
720-823 5 Denver CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2021-03-12   
720-823 6 Denver CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2021-03-12   
720-823 7 Denver CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2021-03-12   
720-823 8 Denver CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2021-03-12   
720-823 9 Denver CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2021-03-12   

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

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.