Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4TSB callsign genealogy
Currently held by DROSS, MICHAEL W
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 N4TSB's current licensee, walking backwards.
- Byrd, Timothy SNCgranted 2026-03-10cancelled 2026-04-11
Successor callsigns
Callsigns held now by people who previously held N4TSB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4TSB, oldest first.
- DROSS, MICHAEL W NC2009-03-19 → cancelled 2021-03-20
- Byrd, Timothy S NC2026-04-11 active