Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4FRZ callsign genealogy
Currently held by Christensen, Michael W
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 K4FRZ's current licensee, walking backwards.
- Christensen, Michael WHIgranted 2018-03-29cancelled 2018-04-21
Successor callsigns
Callsigns held now by people who previously held K4FRZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4FRZ, oldest first.
- ANDERSON, ROY S CA1987-10-13 → cancelled 1999-10-14
- Christensen, Michael W TN2018-04-21 active