Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KN4SO callsign genealogy
Currently held by Richardson, Marc 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 KN4SO's current licensee, walking backwards.
- Richardson, Marc ETNgranted 2017-07-17cancelled 2017-09-02
Successor callsigns
Callsigns held now by people who previously held KN4SO.
- Richardson, Marc ETNgranted 2018-01-17
All historical holders
Every license row we've seen with the callsign KN4SO, oldest first.
- KIOUS, JIMMY D VA2000-09-26 → cancelled 2012-11-21
- Richardson, Marc E TN2017-09-02 → cancelled 2018-01-17