Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC1JWB callsign genealogy
Currently held by Rudolph, Jonathan E
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 KC1JWB's current licensee, walking backwards.
- Bigos Jr, Joseph WMAgranted 2026-01-10cancelled 2026-01-30
Successor callsigns
Callsigns held now by people who previously held KC1JWB.
- Rudolph, Jonathan EMAgranted 2018-06-26
All historical holders
Every license row we've seen with the callsign KC1JWB, oldest first.
- Rudolph, Jonathan E MA2018-06-06 → cancelled 2018-06-26
- Bigos Jr, Joseph W MA2026-01-30 active