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: CSPRWYDNIMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
307-216 9 Lusk WY 495J STRATUS NETWORKS 654   2021-03-31   
307-306 A Douglas WY 495J STRATUS NETWORKS 654      
307-306 1 Douglas WY 495J STRATUS NETWORKS 654   2021-02-19   
307-461 8 Sheridan WY 495J STRATUS NETWORKS 654   2021-04-08   

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

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.