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.

Byers, CO

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
303-822 A BYRSCOXCDS0  2181 BIJOU TEL. COOP. ASSN., INC. 656      
720-906 A DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656      
720-906 1 DNVRCOMA39Z  318J COMCAST IP PHONE, LLC 656   2022-01-17   

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.