Confidence: Medium · Source: FCC ULS · As of 2026-09-11
KB9MAS callsign genealogy
Currently held by Jesko, James 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 KB9MAS's current licensee, walking backwards.
- Jesko, JosephINgranted 2005-06-07cancelled 2009-06-05
Successor callsigns
Callsigns held now by people who previously held KB9MAS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB9MAS, oldest first.
- Jesko, James J IN2005-09-01 → cancelled 2009-03-28
- Jesko, Joseph IN2019-04-09 active