Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4JJZ callsign genealogy
Currently held by WOODRUFF, ROBERT A
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 K4JJZ's current licensee, walking backwards.
- ZEIGLER, JAMES JSCgranted 2020-02-10cancelled 2020-04-14
Successor callsigns
Callsigns held now by people who previously held K4JJZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4JJZ, oldest first.
- WOODRUFF, ROBERT A FL2007-03-22 → cancelled 2019-05-21
- ZEIGLER, JAMES J SC2020-04-14 active