Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB7MDB callsign genealogy
Currently held by SWART, MARSHALL K
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 KB7MDB's current licensee, walking backwards.
- Brewer, Michael DAZgranted 2020-01-21cancelled 2020-02-11
Successor callsigns
Callsigns held now by people who previously held KB7MDB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB7MDB, oldest first.
- SWART, MARSHALL K AZ1991-02-05 → cancelled 2003-02-06
- Brewer, Michael D AZ2020-02-11 active