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.

Switch: MDSRWIKE6MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
353-200 7 Madison WI 321J HD CARRIER LLC 354   2026-04-09   
353-201 1 Madison WI 321J HD CARRIER LLC 354   2026-04-09   
353-201 2 Madison WI 321J HD CARRIER LLC 354   2026-04-09   
608-722 A Madison WI 321J HD CARRIER LLC 354      
608-722 9 Madison WI 321J HD CARRIER LLC 354   2020-11-23   
608-920 A Stoughton WI 321J HD CARRIER LLC 354   2025-09-08   
608-920 8 Stoughton WI 321J HD CARRIER LLC 354   2025-09-08   
608-920 9 Stoughton WI 321J HD CARRIER LLC 354   2025-09-08   
608-961 6 Madison WI 321J HD CARRIER LLC 354   2025-08-11   
608-961 7 Madison WI 321J HD CARRIER LLC 354   2025-08-11   
608-991 2 Beloit WI 321J HD CARRIER LLC 354   2026-06-11   
608-991 3 Beloit WI 321J HD CARRIER LLC 354   2026-06-11   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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