Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4BDU callsign genealogy
Currently held by St John, James R
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 K4BDU's current licensee, walking backwards.
- St John, James RALgranted 2015-06-09cancelled 2016-05-24
Successor callsigns
Callsigns held now by people who previously held K4BDU.
No current licensee on record previously held this callsign.