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.

Greenbush, WI

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
920-506 A PLMOWIXAEMD  624H ONVOY SPECTRUM, LLC 356      
920-506 0   145J TERRA NOVA TELECOM INC. 356   2025-08-24   
920-506 7   624H ONVOY SPECTRUM, LLC 356   2021-09-03   
920-526 A GNBSWIXARS0  0886 FRONTIER NORTH INC. - WI 356      
920-526 0   007F BANDWIDTH.COM CLEC, LLC - WI 356   2008-11-22   
920-526 1   225C ONVOY, LLC - WI 356   2020-04-19   
920-526 2   225C ONVOY, LLC - WI 356   2021-01-15   
920-526 3   0886 FRONTIER NORTH INC. - WI 356      
920-526 4   5489 LEVEL 3 COMMUNICATIONS, LLC - WI 356   2004-07-20   
920-526 5   5489 LEVEL 3 COMMUNICATIONS, LLC - WI 356   2005-11-12   
920-526 6   508J CENTURYLINK COMMUNICATIONS, LLC 356   2015-01-02   
920-526 7   225C ONVOY, LLC - WI 356   2021-01-15   
920-526 8   793K TWC IP ENABLED SERVICES, LLC 356   2007-08-03   
920-526 9   225C ONVOY, LLC - WI 356   2021-01-15   

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.