Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9MRZ callsign genealogy
Currently held by WEAVER, DAVID P
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 K9MRZ's current licensee, walking backwards.
- ZIELEZINSKI, MICHAEL RILgranted 2020-01-07cancelled 2020-01-25
Successor callsigns
Callsigns held now by people who previously held K9MRZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9MRZ, oldest first.
- WEAVER, DAVID P IL2003-01-14 → cancelled 2015-01-15
- ZIELEZINSKI, MICHAEL R IL2020-01-25 active