Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4MFD callsign genealogy
Currently held by HABERMANN, CARL L
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 W4MFD's current licensee, walking backwards.
- Downey, Jerry PSCgranted 2012-08-31cancelled 2017-02-22
Successor callsigns
Callsigns held now by people who previously held W4MFD.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4MFD, oldest first.
- HABERMANN, CARL L FL1996-12-11 → cancelled 2008-12-12
- DOWNEY, JERRY P SC2017-02-22 active