Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4DDA callsign genealogy
Currently held by Grotenberg, David M
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 W4DDA's current licensee, walking backwards.
- Grotenberg, David MFLgranted 2017-08-14cancelled 2017-09-02
Successor callsigns
Callsigns held now by people who previously held W4DDA.
- Anderson, Douglas DALgranted 2022-01-25
All historical holders
Every license row we've seen with the callsign W4DDA, oldest first.
- Anderson, Douglas D AL2008-05-02 → cancelled 2012-02-10
- Grotenberg, David M FL2017-09-02 active