Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB4DTU callsign genealogy
Currently held by Loeffler, Jeffrey D
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 KB4DTU's current licensee, walking backwards.
- Loeffler, Jeffrey DVAgranted 2022-03-09cancelled 2022-04-01
Successor callsigns
Callsigns held now by people who previously held KB4DTU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB4DTU, oldest first.
- LOEFFLER, JEFFREY D VA1988-03-08 → cancelled 2000-03-09
- Loeffler, Jeffrey D FL2022-04-01 active