Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB3DKX callsign genealogy
Currently held by O'BRIEN, JOHN A
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 KB3DKX's current licensee, walking backwards.
- OBRIEN, JOHN AMDgranted 2024-04-30cancelled 2024-05-18
Successor callsigns
Callsigns held now by people who previously held KB3DKX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB3DKX, oldest first.
- O'BRIEN, JOHN A MD1999-02-20 → cancelled 2011-02-23
- OBRIEN, JOHN A MD2024-05-18 active