Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K6SU callsign genealogy
Currently held by Shamrock Radio Club
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 K6SU's current licensee, walking backwards.
- KG6TTOcancelledShamrock Radio ClubCAgranted 2004-02-09cancelled 2004-04-06
Successor callsigns
Callsigns held now by people who previously held K6SU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K6SU, oldest first.
- MALMIN, GLENN F AZ1993-10-19 → cancelled 2001-03-03
- Shamrock Radio Club CA2024-03-02 active