Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N6MMJ callsign genealogy
Currently held by Clausen, Craig K
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 N6MMJ's current licensee, walking backwards.
- Clausen, Craig KIDgranted 2020-10-23cancelled 2020-12-22
Successor callsigns
Callsigns held now by people who previously held N6MMJ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N6MMJ, oldest first.
- CLAUSEN, KEITH C CA2005-11-22 → cancelled 2018-02-02
- Clausen, Craig K ID2020-12-22 active