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.

Colstrip, MT

<< 1 2

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
406-749 5 FRSYMTMA0MD  8140 RANGE TELEPHONE COOPERATIVE, INC. - MT 650   2023-12-12   
406-749 9   145J TERRA NOVA TELECOM INC. 650   2024-02-12   

<< 1 2

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.