Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4DZZ callsign genealogy
Currently held by Thibodeau Sr, Joseph L
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 KO4DZZ's current licensee, walking backwards.
- Thibodeau Sr, Joseph LVAgranted 2022-05-03cancelled 2025-02-28
Successor callsigns
Callsigns held now by people who previously held KO4DZZ.
- Thibodeau Sr, Joseph LVAgranted 2022-05-03cancelled 2025-02-28
All historical holders
Every license row we've seen with the callsign KO4DZZ, oldest first.
- Thibodeau Sr, Joseph L VA2020-06-05 → cancelled 2022-05-03
- Thibodeau Sr, Joseph L VA2025-02-28 active