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: CHYNWYRF6MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
307-400 A Cheyenne WY 145J TERRA NOVA TELECOM INC. 654      
307-449 4 Rock Springs WY 145J TERRA NOVA TELECOM INC. 654   2024-06-27   
307-650 0 Cheyenne WY 145J TERRA NOVA TELECOM INC. 654   2024-05-26   

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.