Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB9IS callsign genealogy
Currently held by Sawicki, Ireneusz M
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 KB9IS's current licensee, walking backwards.
- Sawicki, Ireneusz MILgranted 2018-12-07cancelled 2019-03-23
Successor callsigns
Callsigns held now by people who previously held KB9IS.
- Sawicki, Ireneusz MILgranted 2021-03-26
All historical holders
Every license row we've seen with the callsign KB9IS, oldest first.
- Henry, Richard J FL2004-08-02 → cancelled 2016-10-25
- Sawicki, Ireneusz M IL2019-03-23 → cancelled 2021-03-26