Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC1FRZ callsign genealogy
Currently held by Dyro, David 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 KC1FRZ's current licensee, walking backwards.
- Dyro, David SMEgranted 2016-05-10cancelled 2018-08-10
Successor callsigns
Callsigns held now by people who previously held KC1FRZ.
- Dyro, David SMEgranted 2016-05-10cancelled 2018-08-10
All historical holders
Every license row we've seen with the callsign KC1FRZ, oldest first.
- Dyro, David S ME2016-05-10 → cancelled 2016-08-09
- Dyro, David S ME2018-08-10 active