Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KN4SEF callsign genealogy
Currently held by KING, ROY 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 KN4SEF's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KN4SEF.
- KING, ROY ASCgranted 2020-01-14cancelled 2020-02-04
All historical holders
Every license row we've seen with the callsign KN4SEF, oldest first.
- KING, ROY A SC2019-02-08 → cancelled 2020-01-14
- KING, ROY A SC2020-02-04 active