Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD4SWK callsign genealogy
Currently held by LAVIN JR, 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 KD4SWK's current licensee, walking backwards.
- Lavin, Thomas ANCgranted 2024-07-23cancelled 2024-08-16
Successor callsigns
Callsigns held now by people who previously held KD4SWK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD4SWK, oldest first.
- LAVIN JR, THOMAS A NC1993-03-02 → cancelled 2005-03-03
- Lavin, Thomas A NC2024-08-16 active