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: 230

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
983-230 A Longmont CO   026D ONVOY, LLC - CO 656   2026-10-17   
983-230 0 Longmont CO   026D ONVOY, LLC - CO 656   2026-10-17   
983-230 1 Longmont CO   026D ONVOY, LLC - CO 656   2026-10-17   
983-230 2 Longmont CO   078F BANDWIDTH.COM CLEC, LLC - CO 656   2026-11-07   
983-230 7 Longmont CO   809C INTRADO COMMUNICATIONS, LLC 656   2026-10-19   
983-230 8 Longmont CO   078F BANDWIDTH.COM CLEC, LLC - CO 656   2026-10-19   
983-230 9 Longmont CO   078F BANDWIDTH.COM CLEC, LLC - CO 656   2026-10-19   

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.