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.

West Belle Fourche, WY

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
307-405 A SXFLSDCOTMD  450F ONVOY, LLC - WY 640      
307-405 1   450F ONVOY, LLC - WY 640   2023-07-23   
307-785 A SXFLSDCOTMD  450F ONVOY, LLC - WY 640      
307-785 0   450F ONVOY, LLC - WY 640   2017-05-19   
307-785 1   073H TELNYX LLC 640   2019-10-21   
307-785 2   450F ONVOY, LLC - WY 640   2021-07-11   
307-785 3   450F ONVOY, LLC - WY 640   2019-09-07   
307-785 4   450F ONVOY, LLC - WY 640   2021-03-02   
307-785 5   450F ONVOY, LLC - WY 640   2021-03-02   
307-785 6   624H ONVOY SPECTRUM, LLC 640   2021-07-18   
307-785 7   508J CENTURYLINK COMMUNICATIONS, LLC 640   2017-06-08   
307-785 8   450F ONVOY, LLC - WY 640   2018-11-04   
307-785 9   9416 LEVEL 3 COMMUNICATIONS, LLC - WY 640   2023-01-27   
307-896 A BLFRSDCORS1  9631 QWEST CORPORATION 640      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.