Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WD0EXF callsign genealogy
Currently held by BOLLIS, CHRISTOPHER J
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 WD0EXF's current licensee, walking backwards.
- Bollis, MatthewMNgranted 2025-04-02cancelled 2025-07-18
Successor callsigns
Callsigns held now by people who previously held WD0EXF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WD0EXF, oldest first.
- BOLLIS, CHRISTOPHER J MN2014-02-25 → cancelled 2023-06-27
- Bollis, Matthew MN2025-07-18 active