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.

Montfort, WI

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
608-943 A MTFTWIXARS0  1159 BRIGHTSPEED OF CENTRAL WISCONSIN, LLC 354      
608-943 0   792K CHARTER IP ENABLED SERVICES, LLC 354   2007-01-20   
608-943 6   1159 BRIGHTSPEED OF CENTRAL WISCONSIN, LLC 354      
608-943 7   5489 LEVEL 3 COMMUNICATIONS, LLC - WI 354   2014-12-05   
608-943 8   1159 BRIGHTSPEED OF CENTRAL WISCONSIN, LLC 354      
608-943 9   145J TERRA NOVA TELECOM INC. 354   2025-08-16   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.