Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4RUF callsign genealogy
Currently held by Ruff, John C
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 K4RUF's current licensee, walking backwards.
- Ruff, John CNCgranted 2020-01-22cancelled 2020-02-25
Successor callsigns
Callsigns held now by people who previously held K4RUF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4RUF, oldest first.
- GRISHAM, TILMON J TN1998-05-19 → cancelled 2010-05-20
- Ruff, John C NC2020-02-25 active