Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4JDG callsign genealogy
Currently held by Gramm, John D
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 W4JDG's current licensee, walking backwards.
- GRAMM, JOHN DFLgranted 1995-07-25cancelled 2003-12-23
Successor callsigns
Callsigns held now by people who previously held W4JDG.
No current licensee on record previously held this callsign.