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: 608 [Rate centres in NPA 608] [Dial plan for NPA 608]

NXX: 504

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
608-504 A Madison WI MDSNWIADRMD  6692 NEW CELL DBA CELLCOM 354      
608-504 0 Madison WI MDSNWI11XQX  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 354   2016-06-26   
608-504 1 Madison WI MDSNWI11XQX  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 354   2016-06-26   
608-504 2 Madison WI MDSNWI11XIX  007F BANDWIDTH.COM CLEC, LLC - WI 354   2016-07-15   
608-504 3 Madison WI MDSNWI11XIX  007F BANDWIDTH.COM CLEC, LLC - WI 354   2016-07-15   
608-504 4 Madison WI MDSNWI02ZMD  7216 TELEPORT COMMUNICATIONS AMERICA, LLC WI 354   2016-06-25   
608-504 5 Madison WI MDSNWI02ZMD  7216 TELEPORT COMMUNICATIONS AMERICA, LLC WI 354   2016-06-25   
608-504 6 Madison WI MDSNWI11XEY  6508 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 354   2016-09-30   
608-504 7 Madison WI MDSNWI11XQX  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 354   2016-09-26   
608-504 8 Madison WI MDSNWI11XQX  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 354   2016-09-30   
608-504 9 Madison WI MDSNWIADRMD  6692 NEW CELL DBA CELLCOM 354   2016-06-24   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.