Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AF4X callsign genealogy
Currently held by COX, JOSEPH 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 AF4X's current licensee, walking backwards.
- Kraus, Alfred AGAgranted 2000-06-07cancelled 2000-09-06
Successor callsigns
Callsigns held now by people who previously held AF4X.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AF4X, oldest first.
- COX, JOSEPH R GA1988-07-26 → cancelled 2000-07-27
- Kraus, Alfred A CA2020-09-09 active