Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4SOM callsign genealogy
Currently held by Ohno, Tsutomu
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 K4SOM's current licensee, walking backwards.
- Ohno, TsutomuALgranted 2026-01-27cancelled 2026-03-03
Successor callsigns
Callsigns held now by people who previously held K4SOM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4SOM, oldest first.
- Tompkins, Steve A FL2012-12-27 → cancelled 2024-12-28
- Ohno, Tsutomu AL2026-03-03 active