Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WK1S callsign genealogy
Currently held by Ito Mr, Sadao
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by WK1S's current licensee, walking backwards.
- Ito, SadaoCAgranted 2008-09-25cancelled 2010-02-09
Successor callsigns
Callsigns held now by people who previously held WK1S.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WK1S, oldest first.
- MC LAUGHLIN, JOHN W CT2000-07-18 → cancelled 2007-09-24
- Ito Mr, Sadao FL2019-11-13 active