Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9MS callsign genealogy
Currently held by JORDAN, MARK F
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 K9MS's current licensee, walking backwards.
- JORDAN, MARK FWIgranted 2011-09-02cancelled 2015-08-28
Successor callsigns
Callsigns held now by people who previously held K9MS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9MS, oldest first.
- SOBCZAK, MATTHEW E IL2006-03-31 → cancelled 2013-08-09
- JORDAN, MARK F WI2025-06-19 active