Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W6CDM callsign genealogy
Currently held by WITTENBROCK, HERBERT 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 W6CDM's current licensee, walking backwards.
- Perez, Vincent MCAgranted 2010-03-03cancelled 2010-03-23
Successor callsigns
Callsigns held now by people who previously held W6CDM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W6CDM, oldest first.
- WITTENBROCK, HERBERT W CA1990-10-02 → cancelled 2002-10-03
- Perez, Vincent M CA2020-01-11 active