Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4SIM callsign genealogy
Currently held by BRYAN, THOMAS J
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 N4SIM's current licensee, walking backwards.
- Stankiewicz, Simeon FCTgranted 2024-01-17cancelled 2024-02-27
Successor callsigns
Callsigns held now by people who previously held N4SIM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4SIM, oldest first.
- BRYAN, THOMAS J FL1988-03-15 → cancelled 2000-03-16
- Stankiewicz, Simeon F CT2024-02-27 active