Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KM4OSP callsign genealogy
Currently held by Yell II, Billy R
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 KM4OSP's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KM4OSP.
- Yell II, Billy RALgranted 2026-05-09