Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4MRZ callsign genealogy
Currently held by WELLER, CHARLES S
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 K4MRZ's current licensee, walking backwards.
- Schollbach, MoritzVAgranted 2020-10-06cancelled 2020-10-27
Successor callsigns
Callsigns held now by people who previously held K4MRZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4MRZ, oldest first.
- WELLER, CHARLES S NC2002-01-29 → cancelled 2014-04-29
- Schollbach, Moritz VA2020-10-27 active