Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4SFS callsign genealogy
Currently held by Schlembach, Steven F
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 N4SFS's current licensee, walking backwards.
- SCHLEMBACH, STEVEN FFLgranted 2017-03-07cancelled 2019-07-23
Successor callsigns
Callsigns held now by people who previously held N4SFS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4SFS, oldest first.
- COMBS, JOHN F FL1988-03-08 → cancelled 2000-03-09
- Schlembach, Steven F FL2019-07-23 active