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: WMNSCOMADS0

Remotes:

Switch Switch name Switch type
DNVRCOZJRS0  DENVER  5ER 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
303-412 A Denver CO 9636 QWEST CORPORATION 656      
303-426 A Denver CO 9636 QWEST CORPORATION 656      
303-427 A Denver CO 9636 QWEST CORPORATION 656      
303-428 A Denver CO 9636 QWEST CORPORATION 656      
303-429 A Denver CO 9636 QWEST CORPORATION 656      
303-430 A Denver CO 9636 QWEST CORPORATION 656      
303-487 A Denver CO 9636 QWEST CORPORATION 656      
303-650 A Denver CO 9636 QWEST CORPORATION 656      
303-657 A Denver CO 9636 QWEST CORPORATION 656      
303-658 2 Denver CO 9636 QWEST CORPORATION 656      
303-658 4 Denver CO 9636 QWEST CORPORATION 656      
720-540 A Denver CO 9636 QWEST CORPORATION 656      
720-542 A Denver CO 9636 QWEST CORPORATION 656      
720-542 0 Denver CO 9636 QWEST CORPORATION 656      
720-542 1 Denver CO 9636 QWEST CORPORATION 656      
720-542 2 Denver CO 9636 QWEST CORPORATION 656      
720-542 4 Denver CO 9636 QWEST CORPORATION 656      
720-542 5 Denver CO 9636 QWEST CORPORATION 656      

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

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