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.

Mount Horeb, WI

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
608-437 A MTHBWIXADS2  0916 MT. HOREB TEL. CO. 354      
608-670 A FTBGWIDKGT0  3839 CHARTER FIBERLINK, LLC - WI 354      
608-670 0 FTBGWIDKGT0  3839 CHARTER FIBERLINK, LLC - WI 354   2020-07-30   
608-670 7 MDSNWI025MD  5489 LEVEL 3 COMMUNICATIONS, LLC - WI 354   2024-01-25   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.