Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4SJM callsign genealogy
Currently held by IRBY, JERRY D
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 N4SJM's current licensee, walking backwards.
- MARBACH, STEVEN JVAgranted 2016-06-22cancelled 2016-09-02
Successor callsigns
Callsigns held now by people who previously held N4SJM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4SJM, oldest first.
- IRBY, JERRY D VA1997-12-05 → cancelled 2009-12-08
- MARBACH, STEVEN J VA2016-09-02 active