Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AD4JB callsign genealogy
Currently held by Barr, John E
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 AD4JB's current licensee, walking backwards.
- Barr, John EFLgranted 2015-09-11cancelled 2020-03-31
Successor callsigns
Callsigns held now by people who previously held AD4JB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AD4JB, oldest first.
- HALL, JOHN W TN2003-07-02 → cancelled 2015-09-01
- Barr, John E FL2020-03-31 active