Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD9YY callsign genealogy
Currently held by ZEHMS, MATTHEW 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 KD9YY's current licensee, walking backwards.
- Sullivan, ShawnINgranted 2014-04-15cancelled 2017-05-06
Successor callsigns
Callsigns held now by people who previously held KD9YY.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD9YY, oldest first.
- ZEHMS, MATTHEW D WI1995-05-05 → cancelled 2007-05-08
- Sullivan, Shawn S IN2017-05-06 active