Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KO4MB callsign genealogy
Currently held by DORSEY JR, CLARK L
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 KO4MB's current licensee, walking backwards.
- BROWN, MARK AALgranted 2014-01-16cancelled 2020-09-29
Successor callsigns
Callsigns held now by people who previously held KO4MB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KO4MB, oldest first.
- DORSEY JR, CLARK L VA2001-08-01 → cancelled 2013-11-05
- Brown, Mark A AL2020-09-29 active