Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WA4UPD callsign genealogy
Currently held by BRISTOR, WILLIAM 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 WA4UPD's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held WA4UPD.
- BRISTOR, WILLIAM RFLgranted 2022-03-25