Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KT5MSR callsign genealogy
Currently held by Riaboy, Mark S
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 KT5MSR's current licensee, walking backwards.
- Riaboy, Mark STXgranted 2019-03-29cancelled 2019-04-23
Successor callsigns
Callsigns held now by people who previously held KT5MSR.
No current licensee on record previously held this callsign.