Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4IFS callsign genealogy
Currently held by LEWIS, THOMAS 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 K4IFS's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held K4IFS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4IFS, oldest first.
- YARBROUGH, E CATHERINE FL1987-11-24 → cancelled 1999-11-25
- LEWIS, THOMAS J AL2024-12-10 active