Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4DIP callsign genealogy
Currently held by Masters, Frederick J
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 W4DIP's current licensee, walking backwards.
- Masters, Frederick JFLgranted 2020-12-01cancelled 2020-12-19
Successor callsigns
Callsigns held now by people who previously held W4DIP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4DIP, oldest first.
- FURR, JAMES A AZ1996-04-05 → cancelled 2008-04-08
- Masters, Frederick J FL2020-12-19 active