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: 424

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
307-424 A Lake WY BLNGMTAS9MD  450F ONVOY, LLC - WY 650      
307-424 0 Lake WY BLNGMTAS9MD  450F ONVOY, LLC - WY 650   2024-01-08   
307-424 1 Lake WY BLNGMTAS9MD  450F ONVOY, LLC - WY 650   2023-07-23   
307-424 2 Lake WY BLNGMTWEDMD  624H ONVOY SPECTRUM, LLC 650   2025-01-16   

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.