Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4BOS callsign genealogy
Currently held by O Sullivan, Brian P
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 K4BOS's current licensee, walking backwards.
- Bosarge, Damian LALgranted 2024-11-14cancelled 2025-01-11
Successor callsigns
Callsigns held now by people who previously held K4BOS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4BOS, oldest first.
- O Sullivan, Brian P FL2012-05-24 → cancelled 2024-08-20
- Bosarge, Damian L AL2025-01-11 active