Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WI9J callsign genealogy
Currently held by MC MAHON, THOMAS A
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 WI9J's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held WI9J.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WI9J, oldest first.
- MC MAHON, THOMAS A CA2010-12-17 → cancelled 2021-01-27
- Wilson, Roger L CA2021-02-17 active