Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K6DNK callsign genealogy
Currently held by Bierwirth, Daniel B
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 K6DNK's current licensee, walking backwards.
- Bierwirth, Daniel BCAgranted 2015-01-21cancelled 2015-11-03
Successor callsigns
Callsigns held now by people who previously held K6DNK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K6DNK, oldest first.
- MONTGOMERY, WILLIAM R CA1988-09-06 → cancelled 2000-09-07
- Bierwirth, Daniel B CA2025-12-09 active