Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Denver, CO

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
983-999 5 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2023-10-21   
983-999 6 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2023-10-21   
983-999 7 DNVRCOMA53Z  732J NUSO, LLC 656   2024-01-30   
983-999 8 DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2023-10-09   
983-999 9 DNVRCOMA22Z  557H WIDE VOICE, LLC - CO 656   2023-10-08   

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Last updated: Wed, 04 Mar 2026 03:00:52 UTC

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