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: DNVRCODCDS0

Remotes:

Switch Switch name Switch type
DNVRCOTCRS1  DENVER TECH CENTER  5ER 

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
303-967 8 Denver CO 9636 QWEST CORPORATION 656      
303-967 9 Denver CO 9636 QWEST CORPORATION 656      
720-200 A Denver CO 9636 QWEST CORPORATION 656      
720-444 A Denver CO 9636 QWEST CORPORATION 656      
720-482 A Denver CO 9636 QWEST CORPORATION 656      
720-488 A Denver CO 9636 QWEST CORPORATION 656      
720-489 A Denver CO 9636 QWEST CORPORATION 656      
720-493 A Denver CO 9636 QWEST CORPORATION 656      
720-528 A Denver CO 9636 QWEST CORPORATION 656      
720-529 A Denver CO 9636 QWEST CORPORATION 656      
720-536 A Denver CO 9636 QWEST CORPORATION 656      
720-536 1 Denver CO 9636 QWEST CORPORATION 656      
720-536 9 Denver CO 9636 QWEST CORPORATION 656      
720-554 A Denver CO 9636 QWEST CORPORATION 656      

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Last updated: Sat, 01 Aug 2026 03:19:33 UTC

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