Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KW4MRT callsign genealogy
Currently held by Probst, Benjamin J
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 KW4MRT's current licensee, walking backwards.
- Probst, Benjamin JMAgranted 2020-06-08cancelled 2020-06-27
Successor callsigns
Callsigns held now by people who previously held KW4MRT.
No current licensee on record previously held this callsign.