Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K1OSB callsign genealogy
Currently held by Osborne, Stephen
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 K1OSB's current licensee, walking backwards.
- Osborne, StephenCAgranted 2020-09-21cancelled 2020-10-14
Successor callsigns
Callsigns held now by people who previously held K1OSB.
No current licensee on record previously held this callsign.