Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4BIO callsign genealogy
Currently held by Von Baumgarten, George S
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 K4BIO's current licensee, walking backwards.
- Von Baumgarten, George SVAgranted 2001-01-08cancelled 2002-03-26
Successor callsigns
Callsigns held now by people who previously held K4BIO.
No current licensee on record previously held this callsign.