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.

Switch: DNVTCOZIDS1

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
983-207 A Longmont CO 026D ONVOY, LLC - CO 656   2024-11-02   
983-212 A Denver CO 026D ONVOY, LLC - CO 656   2024-11-18   

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Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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