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.

Basin, WY

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
307-440 A CSPRWYESPS1  009E BRESNAN BROADBAND OF WYOMING, LLC - WY [CHARTER] 654      
307-440 0 CHYNWYRF2MD  939H COMMIO, LLC 654   2021-11-27   
307-440 1 CHYNWYRF2MD  939H COMMIO, LLC 654   2021-11-27   
307-440 2 CSPRWYESPS1  009E BRESNAN BROADBAND OF WYOMING, LLC - WY [CHARTER] 654   2009-08-09   
307-440 4   145J TERRA NOVA TELECOM INC. 654   2025-07-14   
307-568 A BASNWYXCDS1  2296 TRI-COUNTY TEL. ASSN., INC. 654      

Last updated: Fri, 25 Jul 2025 03:21:23 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.