Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4KDH callsign genealogy
Currently held by LAUFFENBURGER, FRIEDRICH
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 N4KDH's current licensee, walking backwards.
- HELTON, KRISTOPHER DALgranted 2005-07-08cancelled 2008-12-09
Successor callsigns
Callsigns held now by people who previously held N4KDH.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4KDH, oldest first.
- LAUFFENBURGER, FRIEDRICH NC1994-07-14 → cancelled 2006-07-15
- HELTON, KRISTOPHER D AL2018-12-18 active