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: 229

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
983-229 A Denver CO   026D ONVOY, LLC - CO 656   2026-10-11   
983-229 0 Denver CO   026D ONVOY, LLC - CO 656   2026-10-11   
983-229 1 Denver CO   078F BANDWIDTH.COM CLEC, LLC - CO 656   2026-10-12   
983-229 2 Denver CO   078F BANDWIDTH.COM CLEC, LLC - CO 656   2026-10-12   
983-229 3 Denver CO   078F BANDWIDTH.COM CLEC, LLC - CO 656   2026-10-12   
983-229 4 Denver CO   078F BANDWIDTH.COM CLEC, LLC - CO 656   2026-10-12   
983-229 5 Denver CO   078F BANDWIDTH.COM CLEC, LLC - CO 656   2026-10-12   
983-229 6 Denver CO   490J BOOST SUBSCRIBERCO L.L.C. 656   2026-11-02   
983-229 7 Denver CO   078F BANDWIDTH.COM CLEC, LLC - CO 656   2026-10-12   
983-229 8 Denver CO   078F BANDWIDTH.COM CLEC, LLC - CO 656   2026-10-12   
983-229 9 Denver CO   078F BANDWIDTH.COM CLEC, LLC - CO 656   2026-10-12   

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.