Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0SS callsign genealogy
Currently held by TRANCHINA, MICHAEL 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 K0SS's current licensee, walking backwards.
- TRANCHINA, MICHAEL SFLgranted 2013-01-09cancelled 2013-07-30
Successor callsigns
Callsigns held now by people who previously held K0SS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K0SS, oldest first.
- STELK, SAMUEL B NE2002-11-05 → cancelled 2011-07-09
- TRANCHINA, MICHAEL S FL2025-06-21 active