Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC6DAN callsign genealogy
Currently held by BUTTERMANN, KLAUS 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 KC6DAN's current licensee, walking backwards.
- Ainsworth, Dan MCAgranted 2019-12-12cancelled 2020-04-18
Successor callsigns
Callsigns held now by people who previously held KC6DAN.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC6DAN, oldest first.
- BUTTERMANN, KLAUS W CA1999-03-02 → cancelled 2011-03-03
- Ainsworth, Dan M CA2020-04-18 active