Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD9MAS callsign genealogy
Currently held by Siefert, Mark A
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 KD9MAS's current licensee, walking backwards.
- Siefert, Mark AILgranted 2014-08-27cancelled 2017-01-31
Successor callsigns
Callsigns held now by people who previously held KD9MAS.
No current licensee on record previously held this callsign.