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: DNVRCOMBDS0

Remotes:

Switch Switch name Switch type
AURRCOMBRS1  MONAGHAN  5ER 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
303-307 A Denver CO 9636 QWEST CORPORATION 656      
303-371 A Denver CO 9636 QWEST CORPORATION 656      
303-373 A Denver CO 9636 QWEST CORPORATION 656      
303-375 A Denver CO 9636 QWEST CORPORATION 656      
303-459 8 Denver CO 9636 QWEST CORPORATION 656      
303-567 5 Denver CO 9636 QWEST CORPORATION 656      
303-574 A Denver CO 9636 QWEST CORPORATION 656      
303-576 A Denver CO 9636 QWEST CORPORATION 656      
303-585 2 Denver CO 9636 QWEST CORPORATION 656      
303-585 3 Denver CO 9636 QWEST CORPORATION 656      
720-374 A Denver CO 9636 QWEST CORPORATION 656      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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