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.

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
303-203 A Denver CO 9748 AMERICAN MESSAGING SERVICES, LLC 656      
303-212 A Denver CO 9748 AMERICAN MESSAGING SERVICES, LLC 656      
303-259 A Denver CO 9748 AMERICAN MESSAGING SERVICES, LLC 656      
303-310 A Denver CO 9748 AMERICAN MESSAGING SERVICES, LLC 656      
303-392 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      
303-767 A Denver CO 9748 AMERICAN MESSAGING SERVICES, LLC 656      
720-521 A Denver CO 9748 AMERICAN MESSAGING SERVICES, LLC 656      
970-202 A Berthoud CO 9748 AMERICAN MESSAGING SERVICES, LLC 656      
970-621 A Berthoud CO 9748 AMERICAN MESSAGING SERVICES, LLC 656      
970-681 A Greeley CO 9748 AMERICAN MESSAGING SERVICES, LLC 656      

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

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