Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KJ4OK callsign genealogy
Currently held by McCullough Jr, Joseph C
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 KJ4OK's current licensee, walking backwards.
- McCullough Jr, Joseph CALgranted 2016-01-27cancelled 2016-03-18
Successor callsigns
Callsigns held now by people who previously held KJ4OK.
- McCullough Jr, Joseph CALgranted 2018-01-20
All historical holders
Every license row we've seen with the callsign KJ4OK, oldest first.
- MARTIN JR, HARRY O VA2000-06-27 → cancelled 2012-09-05
- McCullough Jr, Joseph C AL2016-03-18 → cancelled 2018-01-20