Confidence: Medium · Source: FCC ULS · As of 2026-09-11
KB1AX callsign genealogy
Currently held by Sypek, Michael S
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 KB1AX's current licensee, walking backwards.
- Sypek, Michael SRIgranted 2012-06-25cancelled 2013-11-09
Successor callsigns
Callsigns held now by people who previously held KB1AX.
- ZAWACKI, STEPHEN JFLgranted 2017-12-12cancelled 2018-11-24
All historical holders
Every license row we've seen with the callsign KB1AX, oldest first.
- Sypek, Michael S RI2023-09-07 active
- ZAWACKI, STEPHEN J— → cancelled 1998-02-06