Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KA9TSU callsign genealogy
Currently held by JUSTIS IV, WILLIAM 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 KA9TSU's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KA9TSU.
- JUSTIS IV, WILLIAM MINgranted 2020-09-21