Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4KOC callsign genealogy
Currently held by Wenzel, Jeffrey B
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 K4KOC's current licensee, walking backwards.
- Wenzel, Jeffrey BNCgranted 2014-01-14cancelled 2021-04-17
Successor callsigns
Callsigns held now by people who previously held K4KOC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4KOC, oldest first.
- SHOEMAKER, ROBERT F VA1998-07-20 → cancelled 2010-07-21
- Wenzel, Jeffrey B NC2021-04-17 active