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.
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Switch: DNVRCOMAX8Z

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
303-203 A Denver CO 9748 AMERICAN MESSAGING SERVICES, LLC 656      
303-259 A Denver CO 9748 AMERICAN MESSAGING SERVICES, LLC 656      
303-508 A Denver CO 9748 AMERICAN MESSAGING SERVICES, LLC 656      
303-509 A Denver CO 9748 AMERICAN MESSAGING SERVICES, LLC 656      
303-510 A Denver CO 9748 AMERICAN MESSAGING SERVICES, LLC 656      
303-528 A Denver CO 9748 AMERICAN MESSAGING SERVICES, LLC 656      
303-559 A Denver CO 9748 AMERICAN MESSAGING SERVICES, LLC 656      
303-580 A Denver CO 9748 AMERICAN MESSAGING SERVICES, LLC 656      

Last updated: Sun, 10 Nov 2019 13:49:34 UTC

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