Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4HRO callsign genealogy
Currently held by Cole, James M
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 K4HRO's current licensee, walking backwards.
- Thomas, Hiroshi DFLgranted 2017-10-16cancelled 2026-05-02
Successor callsigns
Callsigns held now by people who previously held K4HRO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4HRO, oldest first.
- Cole, James M VA2007-09-24 → cancelled 2019-11-19
- Thomas, Hiroshi D FL2026-05-02 active