Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4SDH callsign genealogy
Currently held by HAHN, STEPHEN 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 K4SDH's current licensee, walking backwards.
- HAHN, STEPHEN DSCgranted 2013-01-22cancelled 2014-03-21
Successor callsigns
Callsigns held now by people who previously held K4SDH.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4SDH, oldest first.
- MILLER JR, JOSEPH B VA1995-05-19 → cancelled 2007-05-20
- HAHN, STEPHEN D SC2014-03-21 → cancelled 2026-03-24