Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KN4TM callsign genealogy
Currently held by Shead, Michael P
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 KN4TM's current licensee, walking backwards.
- Shead, Michael PKYgranted 2019-03-21cancelled 2022-09-13
Successor callsigns
Callsigns held now by people who previously held KN4TM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KN4TM, oldest first.
- MAZZAS, JUNE M FL2000-09-13 → cancelled 2012-12-05
- Shead, Michael P KY2022-09-13 active