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: GLDNCOMADS0

Remotes:

Switch Switch name Switch type
MRSNCOMARS1  MORRISON  RSC 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
303-215 A Denver CO 9636 QWEST CORPORATION 656      
303-216 A Denver CO 9636 QWEST CORPORATION 656      
303-271 A Denver CO 9636 QWEST CORPORATION 656      
303-273 A Denver CO 9636 QWEST CORPORATION 656      
303-277 A Denver CO 9636 QWEST CORPORATION 656      
303-278 A Denver CO 9636 QWEST CORPORATION 656      
303-279 A Denver CO 9636 QWEST CORPORATION 656      
303-384 A Denver CO 9636 QWEST CORPORATION 656      
303-982 A Denver CO 9636 QWEST CORPORATION 656      
720-497 A Denver CO 9636 QWEST CORPORATION 656      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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