Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AF4TB callsign genealogy
Currently held by Janssen, John 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 AF4TB's current licensee, walking backwards.
- Janssen, JohnFLgranted 2011-03-23cancelled 2023-07-12
Successor callsigns
Callsigns held now by people who previously held AF4TB.
- Janssen, JohnFLgranted 2011-03-23cancelled 2023-07-12