Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AD0SC callsign genealogy
Currently held by Siebert, Clifford L
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 AD0SC's current licensee, walking backwards.
- Siebert, Clifford LMOgranted 2014-02-14cancelled 2014-04-12
Successor callsigns
Callsigns held now by people who previously held AD0SC.
No current licensee on record previously held this callsign.