Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4OSU callsign genealogy
Currently held by Layne, Chad J
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 W4OSU's current licensee, walking backwards.
- Layne, Chad JOHgranted 2020-04-24cancelled 2020-05-15
Successor callsigns
Callsigns held now by people who previously held W4OSU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4OSU, oldest first.
- Mitchell, Thomas G TN2005-11-21 → cancelled 2018-02-16
- Layne, Chad J OH2020-05-15 active