Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD4US callsign genealogy
Currently held by LITTLE SR, WILLIAM E
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 KD4US's current licensee, walking backwards.
- LITTLE SR, WILLIAM ESCgranted 2012-06-20cancelled 2015-08-04
- WB4NBJno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held KD4US.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD4US, oldest first.
- JACOBS, LOUIS T SC2002-06-25 → cancelled 2014-09-23
- LITTLE SR, WILLIAM E SC2015-08-04 active