Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4TFI callsign genealogy
Currently held by F3 INC
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 K4TFI's current licensee, walking backwards.
- KF4WYXcancelledF3 INCTNgranted 1998-04-16cancelled 2003-04-22
Successor callsigns
Callsigns held now by people who previously held K4TFI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4TFI, oldest first.
- OAKLEY, ROBERT F TN1988-10-11 → cancelled 2000-10-12
- F3 INC TN2013-06-08 → cancelled 2025-06-10