Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K6LEO callsign genealogy
Currently held by O'Halloran III, Leo D
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 K6LEO's current licensee, walking backwards.
- O'Halloran III, Leo DCAgranted 2012-06-22cancelled 2012-07-17
Successor callsigns
Callsigns held now by people who previously held K6LEO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K6LEO, oldest first.
- BROWN, LEO R CA1998-10-20 → cancelled 2010-10-21
- O'Halloran III, Leo D CA2022-07-08 active