Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB4DUC callsign genealogy
Currently held by DOBIS, GARY
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 KB4DUC's current licensee, walking backwards.
- Dobis, GaryFLgranted 2011-09-13cancelled 2011-12-30
Successor callsigns
Callsigns held now by people who previously held KB4DUC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB4DUC, oldest first.
- DOBIS, GARY RI1989-01-17 → cancelled 2001-01-18
- Dobis, Gary FL2021-11-16 active