Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4SLO callsign genealogy
Currently held by Osterholz, Steve L
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 W4SLO's current licensee, walking backwards.
- Osterholz, Steve LNCgranted 2024-10-22cancelled 2024-11-13
Successor callsigns
Callsigns held now by people who previously held W4SLO.
No current licensee on record previously held this callsign.