Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9ZTF callsign genealogy
Currently held by JOHNSON, ALFRED F
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 K9ZTF's current licensee, walking backwards.
- Fensterman, Zach LILgranted 2021-08-31cancelled 2021-12-10
Successor callsigns
Callsigns held now by people who previously held K9ZTF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9ZTF, oldest first.
- JOHNSON, ALFRED F IL2003-09-11 → cancelled 2015-10-14
- FENSTERMAN, ZACH L IL2021-12-10 active