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: DNVRCO26XBY

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
303-303 A Denver CO 557H WIDE VOICE, LLC - CO 656   2024-10-27   
720-820 A Denver CO 557H WIDE VOICE, LLC - CO 656      
983-333 A 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   
983-777 A Denver CO 557H WIDE VOICE, LLC - CO 656      
983-888 A Denver CO 557H WIDE VOICE, LLC - CO 656      
983-999 A Denver CO 557H WIDE VOICE, LLC - CO 656      

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

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