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: ENWDCOVF0MD

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      
303-508 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: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.