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.

NPA: 720 [Rate centres in NPA 720] [Dial plan for NPA 720]

NXX: 721

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
720-721 A Denver CO DNVRCOMA37Z  507J THE VOICE APPLICATION NETWORK, LLC 656      
720-721 0 Denver CO DNVRCOMA32Z  321J HD CARRIER LLC 656      
720-721 1 Denver CO DNVRCOMA37Z  507J THE VOICE APPLICATION NETWORK, LLC 656      
720-721 2 Denver CO DNVRCOMA32Z  321J HD CARRIER LLC 656      
720-721 3 Denver CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656      
720-721 4 Denver CO DNVRCOMA32Z  321J HD CARRIER LLC 656      
720-721 5 Denver CO DNVRCOMA32Z  321J HD CARRIER LLC 656      
720-721 6 Denver CO DNVRCOMA32Z  321J HD CARRIER LLC 656      
720-721 7 Denver CO DNVRCOMA32Z  321J HD CARRIER LLC 656      
720-721 8 Denver CO DNVRCOMA32Z  321J HD CARRIER LLC 656      
720-721 9 Denver CO DNVRCOMA24Z  557H WIDE VOICE, LLC - CO 656      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.