Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9FUK callsign genealogy
Currently held by NADIR, MARK
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 K9FUK's current licensee, walking backwards.
- Firestone, James CORgranted 2020-02-21cancelled 2020-03-13
Successor callsigns
Callsigns held now by people who previously held K9FUK.
- NADIR, MARKNYgranted 2017-06-17cancelled 2017-07-07
All historical holders
Every license row we've seen with the callsign K9FUK, oldest first.
- NADIR, MARK NY2017-05-27 → cancelled 2017-06-17
- Firestone, James C OR2020-03-13 active