Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K5MZT callsign genealogy
Currently held by POLK, JUNIA 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 K5MZT's current licensee, walking backwards.
- Tschirhart, Michael ZTXgranted 2015-06-24cancelled 2017-07-25
Successor callsigns
Callsigns held now by people who previously held K5MZT.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K5MZT, oldest first.
- POLK, JUNIA L TX2005-01-28 → cancelled 2017-04-28
- Tschirhart, Michael Z TX2017-07-25 active