Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KO4JKB callsign genealogy
Currently held by Balassa, Julie K
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 KO4JKB's current licensee, walking backwards.
- Balassa, Julie KFLgranted 2017-11-21cancelled 2017-12-12
Successor callsigns
Callsigns held now by people who previously held KO4JKB.
No current licensee on record previously held this callsign.