Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD7JSU callsign genealogy
Currently held by o Brien, Michael C
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 KD7JSU's current licensee, walking backwards.
- OBRIEN, MICHAEL CWAgranted 2024-06-25
Successor callsigns
Callsigns held now by people who previously held KD7JSU.
No current licensee on record previously held this callsign.