Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB0NA callsign genealogy
Currently held by Helfrich 519, John M
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 KB0NA's current licensee, walking backwards.
- Helfrich, John MWIgranted 2022-05-18cancelled 2022-09-24
Successor callsigns
Callsigns held now by people who previously held KB0NA.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB0NA, oldest first.
- Helfrich, William C MN2004-11-12 → cancelled 2017-01-11
- Helfrich 519, John M WI2022-09-24 active