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: DNVRCOMA32Z

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
720-721 0 Denver CO 321J HD CARRIER LLC 656   2016-06-12   
720-721 2 Denver CO 321J HD CARRIER LLC 656   2016-06-12   
720-721 4 Denver CO 321J HD CARRIER LLC 656   2016-09-01   
720-721 5 Denver CO 321J HD CARRIER LLC 656   2016-09-01   
720-721 6 Denver CO 321J HD CARRIER LLC 656   2016-09-01   
720-721 7 Denver CO 321J HD CARRIER LLC 656   2016-06-12   
720-721 8 Denver CO 321J HD CARRIER LLC 656   2016-09-01   
720-820 0 Denver CO 321J HD CARRIER LLC 656   2015-11-19   
720-820 2 Denver CO 321J HD CARRIER LLC 656   2015-11-19   
720-820 3 Denver CO 321J HD CARRIER LLC 656   2015-11-19   
720-820 4 Denver CO 321J HD CARRIER LLC 656   2015-11-19   
720-820 5 Denver CO 321J HD CARRIER LLC 656   2015-11-19   
720-820 6 Denver CO 321J HD CARRIER LLC 656   2015-11-19   
720-820 7 Denver CO 321J HD CARRIER LLC 656   2015-11-19   
720-820 8 Denver CO 321J HD CARRIER LLC 656   2015-11-19   
720-820 9 Denver CO 321J HD CARRIER LLC 656   2015-11-19   
720-830 A Denver CO 321J HD CARRIER LLC 656      
720-830 9 Denver CO 321J HD CARRIER LLC 656   2019-01-24   
720-835 4 Denver CO 321J HD CARRIER LLC 656   2016-09-01   
720-835 5 Denver CO 321J HD CARRIER LLC 656   2016-09-01   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

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