Confidence: Medium · Source: FCC ULS · As of 2026-09-09
K4KOO callsign genealogy
Currently held by SMITH, HARRISON S
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 K4KOO's current licensee, walking backwards.
- ENGELMAN, JACOBFLgranted 2023-05-05cancelled 2023-05-23
Successor callsigns
Callsigns held now by people who previously held K4KOO.
- ENGELMAN, JACOB NFLgranted 2024-12-06
All historical holders
Every license row we've seen with the callsign K4KOO, oldest first.
- SMITH, HARRISON S NC2010-03-01 → cancelled 2022-05-10
- ENGELMAN, JACOB FL2023-05-23 → cancelled 2024-12-06