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.
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Switch: MDSNWI021MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
608-234 A Madison WI 7421 AT&T LOCAL 354   2021-01-08   
608-234 6 Madison WI 7421 AT&T LOCAL 354      
608-234 9 Madison WI 7421 AT&T LOCAL 354      
608-237 A Madison WI 7421 AT&T LOCAL 354      
608-237 0 Madison WI 7421 AT&T LOCAL 354      
608-237 5 Madison WI 7421 AT&T LOCAL 354      
608-237 9 Madison WI 7421 AT&T LOCAL 354      
608-561 5 Edgerton WI 7421 AT&T LOCAL 354   2009-11-16   
608-676 3 Clinton WI 7421 AT&T LOCAL 354   2006-12-04   
608-678 5 Wisconsin Dells WI 7421 AT&T LOCAL 354   2007-07-09   
608-728 A Janesville WI 7421 AT&T LOCAL 354      
608-728 9 Janesville WI 7421 AT&T LOCAL 354      

Last updated: Tue, 04 May 2021 15:04:27 UTC

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