Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB9MAC callsign genealogy
Currently held by Vanderploeg, Kent 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 KB9MAC's current licensee, walking backwards.
- Cialdella, MichaelILgranted 2021-03-01cancelled 2021-11-30
Successor callsigns
Callsigns held now by people who previously held KB9MAC.
- Vanderploeg, Kent EILgranted 2016-12-09
All historical holders
Every license row we've seen with the callsign KB9MAC, oldest first.
- Vanderploeg, Kent E IL2015-09-23 → cancelled 2016-12-09
- Cialdella, Michael IL2021-11-30 active