Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KS4MRD callsign genealogy
Currently held by Donnell, Mark R
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 KS4MRD's current licensee, walking backwards.
- Donnell, Mark RTNgranted 2016-02-09cancelled 2019-02-09
Successor callsigns
Callsigns held now by people who previously held KS4MRD.
No current licensee on record previously held this callsign.