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: 224

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
983-224 A Denver CO   671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 656   2026-04-28   
983-224 0 Denver CO   078F BANDWIDTH.COM CLEC, LLC - CO 656   2026-04-29   
983-224 1 Denver CO   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2026-04-29   
983-224 2 Denver CO   671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 656   2026-04-28   
983-224 7 Denver CO   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2026-04-29   
983-224 8 Denver CO   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2026-04-29   
983-224 9 Denver CO   6567 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 656   2026-04-29   

Last updated: Tue, 31 Mar 2026 13:56:49 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.