Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KA5UJC callsign genealogy
Currently held by Oster III, Earl N
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 KA5UJC's current licensee, walking backwards.
- Oster, Justin LTXgranted 2022-04-06cancelled 2022-09-20
Successor callsigns
Callsigns held now by people who previously held KA5UJC.
- Oster Jr, Earl NTXgranted 2003-11-15cancelled 2015-11-17
All historical holders
Every license row we've seen with the callsign KA5UJC, oldest first.
- Oster Jr, Earl N TX1995-04-12 → cancelled 2003-11-15
- Oster III, Earl N TX2015-12-11 → cancelled 2021-07-28
- Oster, Justin L TX2022-09-20 active