Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W6OSO callsign genealogy
Currently held by Anderson, Michael 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 W6OSO's current licensee, walking backwards.
- Anderson, Michael RCAgranted 2012-01-20cancelled 2012-12-08
Successor callsigns
Callsigns held now by people who previously held W6OSO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W6OSO, oldest first.
- SEGALMAN, ROBERT Z CA1998-02-03 → cancelled 2010-02-04
- Anderson, Michael R CA2022-09-20 active