Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KL9R callsign genealogy
Currently held by Osterhoudt, Robert
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 KL9R's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KL9R.
No current licensee on record previously held this callsign.