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: 307 [Rate centres in NPA 307] [Dial plan for NPA 307]

NXX: 316

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
307-316 A Cheyenne WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654      
307-316 0 Cheyenne WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2006-05-19   
307-316 1 Cheyenne WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2012-12-13   
307-316 2 Cheyenne WY CHYNWYMAQMD  081F BANDWIDTH.COM CLEC, LLC - WY 654   2014-11-27   
307-316 3 Cheyenne WY CHYNWYMAQMD  081F BANDWIDTH.COM CLEC, LLC - WY 654   2015-05-15   
307-316 4 Cheyenne WY CHYNWYMAQMD  081F BANDWIDTH.COM CLEC, LLC - WY 654   2015-05-15   
307-316 5 Cheyenne WY CHYNWYMAQMD  081F BANDWIDTH.COM CLEC, LLC - WY 654   2015-05-15   
307-316 6 Cheyenne WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2015-12-04   
307-316 7 Cheyenne WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2008-04-11   
307-316 8 Cheyenne WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654   2010-11-14   
307-316 9 Cheyenne WY CHYNWYRFDS0  581H AIRUS, INC. - WY 654   2019-02-28   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.