Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4TZI callsign genealogy
Currently held by Williams, Robert L
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 K4TZI's current licensee, walking backwards.
- TZIKAS, STEPHEN AVAgranted 2017-03-13cancelled 2017-04-04
Successor callsigns
Callsigns held now by people who previously held K4TZI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4TZI, oldest first.
- Williams, Robert L KY2004-02-27 → cancelled 2016-04-20
- TZIKAS, STEPHEN A VA2017-04-04 active