Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4DYF callsign genealogy
Currently held by MC DONALD, ROBERT 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 W4DYF's current licensee, walking backwards.
- KLIETMANN, MAXIMILIAN WSCgranted 2017-09-21cancelled 2017-10-20
Successor callsigns
Callsigns held now by people who previously held W4DYF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4DYF, oldest first.
- MC DONALD, ROBERT L AL2001-07-03 → cancelled 2013-07-04
- KLIETMANN, MAXIMILIAN W SC2017-10-20 active