Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO9JFB callsign genealogy
Currently held by Black, John 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 KO9JFB's current licensee, walking backwards.
- Black, John FFLgranted 2019-11-20cancelled 2020-02-01
Successor callsigns
Callsigns held now by people who previously held KO9JFB.
- Black, John FFLgranted 2020-06-19