Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AD1M callsign genealogy
Currently held by Adler, Mark
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 AD1M's current licensee, walking backwards.
- Adler, MarkCAgranted 2019-11-06cancelled 2020-01-24
Successor callsigns
Callsigns held now by people who previously held AD1M.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AD1M, oldest first.
- REHBEIN, ROY H MA2008-03-04 → cancelled 2018-01-02
- Adler, Mark CA2020-01-24 active