Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD4MAS callsign genealogy
Currently held by SINK, MICHAEL 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 KD4MAS's current licensee, walking backwards.
- SINK, MICHAEL ANCgranted 2012-07-30cancelled 2019-10-04
Successor callsigns
Callsigns held now by people who previously held KD4MAS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD4MAS, oldest first.
- MORRIS, THOMAS D FL1992-03-31 → cancelled 2004-04-01
- SINK, MICHAEL A NC2019-10-04 active