Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4YU callsign genealogy
Currently held by Knauss, Richard W
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 K4YU's current licensee, walking backwards.
- Knauss, Richard WNCgranted 2016-05-20cancelled 2016-09-07
Successor callsigns
Callsigns held now by people who previously held K4YU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4YU, oldest first.
- SMALL, DONALD C NC2004-07-17 → cancelled 2016-08-18
- Knauss, Richard W NC2026-06-11 active