Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB9ZZ callsign genealogy
Currently held by SOBESKI, JAMES 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 KB9ZZ's current licensee, walking backwards.
- Ziegler, ZaneILgranted 2015-05-07cancelled 2025-02-14
Successor callsigns
Callsigns held now by people who previously held KB9ZZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB9ZZ, oldest first.
- SOBESKI, JAMES W IL1991-12-24 → cancelled 2003-12-25
- Ziegler, Zane IL2025-02-14 active