Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W6DUU callsign genealogy
Currently held by Ristrim, Paul R
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 W6DUU's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W6DUU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W6DUU, oldest first.
- RISTRIM, ROBERT L CA1994-07-15 → cancelled 2003-01-11
- Ristrim, Paul R CA2025-06-17 active