Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0SZ callsign genealogy
Currently held by JOHNSON, HARRY D
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 K0SZ's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held K0SZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K0SZ, oldest first.
- JOHNSON, HARRY D NE2007-01-05 → cancelled 2014-09-08
- Johnson, Darren NE2016-08-27 active