Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4SDF callsign genealogy
Currently held by Ferris, Stephen 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 K4SDF's current licensee, walking backwards.
- Ferris, Stephen DFLgranted 2022-05-12cancelled 2022-06-01
Successor callsigns
Callsigns held now by people who previously held K4SDF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4SDF, oldest first.
- LATCHEM, ADA L AL2004-04-22 → cancelled 2016-07-16
- Ferris, Stephen D FL2022-06-01 active