Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4YAR callsign genealogy
Currently held by Klophaus, Russell
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 K4YAR's current licensee, walking backwards.
- Klophaus, RussellDEgranted 2025-11-27cancelled 2025-12-16
Successor callsigns
Callsigns held now by people who previously held K4YAR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4YAR, oldest first.
- Hansel, Chase J FL2009-11-03 → cancelled 2021-11-04
- Klophaus, Russell DE2025-12-16 active