Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9RYW callsign genealogy
Currently held by BUCHWALD, HELMUT H
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 K9RYW's current licensee, walking backwards.
- BUCHWALD, RANDALL HWIgranted 2015-08-31cancelled 2020-07-14
Successor callsigns
Callsigns held now by people who previously held K9RYW.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9RYW, oldest first.
- BUCHWALD, HELMUT H WI2013-09-24 → cancelled 2018-07-23
- BUCHWALD, RANDALL H WI2020-07-14 active