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.

OCN: 016G TELSTAR COMMUNICATIONS INC

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
720-658 A Denver CO WNDSCODCCM0  656      
970-600 A Windsor CO WNDSCODCCM0  656      

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.