Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD5ZEN callsign genealogy
Currently held by Schaefer, David T
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 KD5ZEN's current licensee, walking backwards.
- Frey, Jason MTXgranted 2018-01-29cancelled 2018-07-07
Successor callsigns
Callsigns held now by people who previously held KD5ZEN.
- Schaefer, DavidAZgranted 2026-04-07
All historical holders
Every license row we've seen with the callsign KD5ZEN, oldest first.
- Schaefer, David T TX2013-12-05 → cancelled 2016-06-04
- Frey, Jason M TX2018-07-07 active