Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KR1YYT callsign genealogy
Currently held by Biprogy Ham Radio Club
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 KR1YYT's current licensee, walking backwards.
- KJ6LZIcancelledNihon Unisys Ham FamilyCAgranted 2010-12-28cancelled 2011-01-19
Successor callsigns
Callsigns held now by people who previously held KR1YYT.
No current licensee on record previously held this callsign.