Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KC8ZSU callsign genealogy
Currently held by Hildreth, Robert S
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 KC8ZSU's current licensee, walking backwards.
- Hildreth, Robert SMIgranted 2015-07-03cancelled 2023-04-04
Successor callsigns
Callsigns held now by people who previously held KC8ZSU.
- Hildreth, Robert SMIgranted 2015-07-03cancelled 2023-04-04
All historical holders
Every license row we've seen with the callsign KC8ZSU, oldest first.
- Hildreth, Robert S MI2015-03-07 → cancelled 2015-07-03
- Hildreth, Robert S MI2023-04-04 active