Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4OTF callsign genealogy
Currently held by Thomas, Mark
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 K4OTF's current licensee, walking backwards.
- Thomas, MarkFLgranted 2021-03-03cancelled 2021-03-23
Successor callsigns
Callsigns held now by people who previously held K4OTF.
No current licensee on record previously held this callsign.