Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W7HRF callsign genealogy
Currently held by Willer, Mark
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 W7HRF's current licensee, walking backwards.
- Willer, MarkIDgranted 2019-05-23cancelled 2019-06-18
Successor callsigns
Callsigns held now by people who previously held W7HRF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W7HRF, oldest first.
- DUFFIN, GRANT C UT2006-05-18 → cancelled 2018-05-30
- Willer, Mark ID2019-06-18 active