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: 920 [Rate centres in NPA 920] [Dial plan for NPA 920]

NXX: 951

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
920-951 A Fort Atkinson WI MILWWIAUDS1  225C ONVOY, LLC - WI 356   2024-02-12   
920-951 0 Fort Atkinson WI MILWWIAUDS1  225C ONVOY, LLC - WI 356   2024-02-12   
920-951 1 Fort Atkinson WI   6529 T-MOBILE USA, INC. 356   2025-02-17   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.