Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N9PPO callsign genealogy
Currently held by Zeilstra, Thomas 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 N9PPO's current licensee, walking backwards.
- Zeilstra, Thomas JMDgranted 2011-10-17cancelled 2013-06-18
Successor callsigns
Callsigns held now by people who previously held N9PPO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N9PPO, oldest first.
- ZEILSTRA, JOHN H IL2012-02-29 → cancelled 2013-04-27
- Zeilstra, Thomas J MN2023-06-27 active