Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KC9H callsign genealogy
Currently held by WIERSEMA, JOHN
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 KC9H's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KC9H.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC9H, oldest first.
- HANLOCK, RICHARD A IL2005-03-28 → cancelled 2017-05-23
- WIERSEMA, JOHN IL2017-06-10 active