Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KF4TZK callsign genealogy
Currently held by WITHERSPOON, THOMAS H
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 KF4TZK's current licensee, walking backwards.
- WITHERSPOON, THOMAS Hcancelled 1997-09-18
Successor callsigns
Callsigns held now by people who previously held KF4TZK.
- WITHERSPOON, THOMAS HNCgranted 2020-07-24