Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N4FFL callsign genealogy
Currently held by Gdowski, Mat
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 N4FFL's current licensee, walking backwards.
- Gdowski, Mat AKYgranted 2018-02-16cancelled 2018-03-06
Successor callsigns
Callsigns held now by people who previously held N4FFL.
- MOON, JOHN CVAgranted 2020-05-12
All historical holders
Every license row we've seen with the callsign N4FFL, oldest first.
- MOON, JOHN C NJ1998-04-03 → cancelled 2000-07-04
- Gdowski, Mat CO2018-03-06 active