Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KC4SQN callsign genealogy
Currently held by ISERHARDT, LOUIS J
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 KC4SQN's current licensee, walking backwards.
- ISERHARDT, LOUIS JNCgranted 2016-12-08cancelled 2017-04-21
Successor callsigns
Callsigns held now by people who previously held KC4SQN.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC4SQN, oldest first.
- ISERHARDT III, LOUIS J NC1991-02-26 → cancelled 2003-02-27
- ISERHARDT, LOUIS J NC2017-04-21 active