Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4OSS callsign genealogy
Currently held by Ross, Charles W
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 K4OSS's current licensee, walking backwards.
- Smith, Joshua AGAgranted 2024-03-05cancelled 2025-01-24
Successor callsigns
Callsigns held now by people who previously held K4OSS.
- Ross, Charles WNMgranted 2020-01-24cancelled 2020-06-01
All historical holders
Every license row we've seen with the callsign K4OSS, oldest first.
- Ross, Charles W NM2015-12-01 → cancelled 2020-01-24
- Smith, Joshua A GA2025-01-24 active