Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W7DDR callsign genealogy
Currently held by Mumm, Jonathan
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 W7DDR's current licensee, walking backwards.
- Mumm, Jonathan DWAgranted 2018-08-31cancelled 2018-09-22
Successor callsigns
Callsigns held now by people who previously held W7DDR.
No current licensee on record previously held this callsign.