Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KO4L callsign genealogy
Currently held by COSTA, PHILIP J
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 KO4L's current licensee, walking backwards.
- Mitchell, Lloyd MSCgranted 2001-10-01cancelled 2006-06-30
Successor callsigns
Callsigns held now by people who previously held KO4L.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KO4L, oldest first.
- COSTA, PHILIP J FL1996-05-07 → cancelled 2002-08-23
- Mitchell, Lloyd M SC2026-04-08 active