Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KN5SDB callsign genealogy
Currently held by Birkenfeld, 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 KN5SDB's current licensee, walking backwards.
- Birkenfeld, Stephen DTXgranted 2025-04-02cancelled 2025-05-10
Successor callsigns
Callsigns held now by people who previously held KN5SDB.
No current licensee on record previously held this callsign.