Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KA4YBR callsign genealogy
Currently held by HORTON, MARK A
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 KA4YBR's current licensee, walking backwards.
- Van Kempen, Fred NCAgranted 2006-01-18cancelled 2006-02-22
Successor callsigns
Callsigns held now by people who previously held KA4YBR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KA4YBR, oldest first.
- HORTON, MARK A GA1988-02-02 → cancelled 2000-02-03
- VAN KEMPEN, FRED N IN2026-01-14 active