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.
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Switch: DNVRCOMA22Z

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
720-820 A Denver CO 557H WIDE VOICE, LLC - CO 656      
720-820 1 Denver CO 557H WIDE VOICE, LLC - CO 656   2015-11-19   
983-333 A Denver CO 557H WIDE VOICE, LLC - CO 656   2024-02-18   
983-333 3 Denver CO 557H WIDE VOICE, LLC - CO 656   2024-02-18   
983-444 A Denver CO 557H WIDE VOICE, LLC - CO 656   2024-04-01   
983-444 4 Denver CO 557H WIDE VOICE, LLC - CO 656   2024-04-01   
983-500 A Strasburg CO 557H WIDE VOICE, LLC - CO 656   2026-04-03   
983-500 0 Strasburg CO 557H WIDE VOICE, LLC - CO 656   2026-04-03   
983-500 5 Strasburg CO 557H WIDE VOICE, LLC - CO 656   2026-04-03   
983-777 A Denver CO 557H WIDE VOICE, LLC - CO 656      
983-777 7 Denver CO 557H WIDE VOICE, LLC - CO 656   2023-12-04   
983-800 A Denver CO 557H WIDE VOICE, LLC - CO 656   2026-08-13   
983-800 0 Denver CO 557H WIDE VOICE, LLC - CO 656   2026-08-13   
983-800 8 Denver CO 557H WIDE VOICE, LLC - CO 656   2026-08-13   
983-888 A Denver CO 557H WIDE VOICE, LLC - CO 656      
983-888 8 Denver CO 557H WIDE VOICE, LLC - CO 656   2023-08-05   
983-999 A Denver CO 557H WIDE VOICE, LLC - CO 656      
983-999 9 Denver CO 557H WIDE VOICE, LLC - CO 656   2023-10-08   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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