Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N4TBK callsign genealogy
Currently held by SIMON, IRVIN C
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 N4TBK's current licensee, walking backwards.
- Kandziorski JR, Thomas BALgranted 2024-09-28cancelled 2025-06-21
Successor callsigns
Callsigns held now by people who previously held N4TBK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4TBK, oldest first.
- SIMON, IRVIN C SC1998-03-09 → cancelled 2010-03-10
- Kandziorski JR, Thomas B AL2025-06-21 active