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: 983 [Rate centres in NPA 983] [Dial plan for NPA 983]

NXX: 212

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
983-212 A Denver CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2024-11-18   
983-212 0 Denver CO   026D ONVOY, LLC - CO 656   2024-11-18   
983-212 1 Denver CO   026D ONVOY, LLC - CO 656   2024-11-18   
983-212 2 Denver CO   026D ONVOY, LLC - CO 656   2024-11-18   
983-212 3 Denver CO   026D ONVOY, LLC - CO 656   2024-11-18   
983-212 4 Denver CO   624H ONVOY SPECTRUM, LLC 656   2024-11-19   
983-212 5 Denver CO   624H ONVOY SPECTRUM, LLC 656   2024-11-19   
983-212 6 Denver CO   624H ONVOY SPECTRUM, LLC 656   2024-11-19   
983-212 7 Denver CO   624H ONVOY SPECTRUM, LLC 656   2024-11-19   
983-212 8 Denver CO   624H ONVOY SPECTRUM, LLC 656   2024-11-19   
983-212 9 Denver CO   732J NUSO, LLC 656   2024-12-01   

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.