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: DURNCOMADS0

Remotes:

Switch Switch name Switch type
BYFDCOMARS1  BAYFIELD  RSC 
SLTNCOMARS1  SILVERTON  RSC 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
970-247 A Durango CO 9636 QWEST CORPORATION 656      
970-259 A Durango CO 9636 QWEST CORPORATION 656      
970-335 A Durango CO 9636 QWEST CORPORATION 656      
970-375 A Durango CO 9636 QWEST CORPORATION 656      
970-382 A Durango CO 9636 QWEST CORPORATION 656      
970-385 A Durango CO 9636 QWEST CORPORATION 656      
970-764 A Durango CO 9636 QWEST CORPORATION 656      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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