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: DURNCOMAG00

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
970-403 A Durango CO 588A ZIPPYTECH INCORPORATED 656      
970-403 0 Durango CO 588A ZIPPYTECH INCORPORATED 656   2005-12-11   
970-403 1 Durango CO 588A ZIPPYTECH INCORPORATED 656   2007-11-04   
970-403 8 Durango CO 588A ZIPPYTECH INCORPORATED 656   2009-12-01   
970-426 4 Durango CO 588A ZIPPYTECH INCORPORATED 656   2015-01-10   
970-529 7 Cortez CO 588A ZIPPYTECH INCORPORATED 656   2007-09-29   
970-729 7 Telluride CO 588A ZIPPYTECH INCORPORATED 656   2008-05-09   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

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