Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB4DFO callsign genealogy
Currently held by MARX, ROLF P
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 KB4DFO's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KB4DFO.
- MARX, ROLF PTNgranted 2020-03-04