Confidence: Medium · Source: FCC ULS · As of 2026-09-10
K4API callsign genealogy
Currently held by Warner, Robert H
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 K4API's current licensee, walking backwards.
- Park, Beom SGAgranted 2016-12-21cancelled 2017-01-10
Successor callsigns
Callsigns held now by people who previously held K4API.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4API, oldest first.
- Warner, Robert H GA2002-10-25 → cancelled 2014-10-28
- Park, Beom S GA2017-01-10 active