Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4TFO callsign genealogy
Currently held by Friend, Jason 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 W4TFO's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W4TFO.
- Friend, Jason AALgranted 2020-01-07
All historical holders
Every license row we've seen with the callsign W4TFO, oldest first.
- Friend, Jason A AL2013-04-30 → cancelled 2020-01-07
- Kloss, Jason FL2026-03-21 active