Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD4MAD callsign genealogy
Currently held by RUEHLE, GARY M
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 KD4MAD's current licensee, walking backwards.
- DAY, MARK ASCgranted 2012-07-31cancelled 2018-02-09
Successor callsigns
Callsigns held now by people who previously held KD4MAD.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD4MAD, oldest first.
- RUEHLE, GARY M FL1992-03-24 → cancelled 2004-03-25
- DAY, MARK A SC2018-02-09 active