Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB9YY callsign genealogy
Currently held by BIESTER, JOHN L
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 KB9YY's current licensee, walking backwards.
- POMATTO, JOANNILgranted 2023-05-02cancelled 2023-06-03
Successor callsigns
Callsigns held now by people who previously held KB9YY.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB9YY, oldest first.
- BIESTER, JOHN L WI1994-08-06 → cancelled 2006-08-08
- POMATTO, JOANN IL2023-06-03 active