Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W6CMS callsign genealogy
Currently held by SADLER, CHARLES M
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 W6CMS's current licensee, walking backwards.
- Arndt, Bryan WCAgranted 2019-07-23cancelled 2021-02-17
Successor callsigns
Callsigns held now by people who previously held W6CMS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W6CMS, oldest first.
- SADLER, CHARLES M CA2009-02-11 → cancelled 2017-09-04
- Arndt, Bryan W CA2021-02-17 active