Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N9ISS callsign genealogy
Currently held by TRAPP, CLIFFORD 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 N9ISS's current licensee, walking backwards.
- Grindley, Paul WILgranted 2017-08-08cancelled 2025-02-14
Successor callsigns
Callsigns held now by people who previously held N9ISS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N9ISS, oldest first.
- TRAPP, CLIFFORD M IL1999-10-19 → cancelled 2011-07-19
- Grindley, Paul W IL2025-02-14 active