Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K6TCA callsign genealogy
Currently held by Doering, Mark
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 K6TCA's current licensee, walking backwards.
- DOERING, MARKCAgranted 2017-10-24cancelled 2020-03-14
Successor callsigns
Callsigns held now by people who previously held K6TCA.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K6TCA, oldest first.
- JOHNSON, RICHARD W CA1988-08-23 → cancelled 2000-08-24
- Doering, Mark CA2020-03-14 active