Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KA9CAT callsign genealogy
Currently held by Marro, Robert 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 KA9CAT's current licensee, walking backwards.
- Marro, Robert ERIgranted 2017-11-27cancelled 2017-12-22
Successor callsigns
Callsigns held now by people who previously held KA9CAT.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KA9CAT, oldest first.
- GEHRS, FERDINAND J IL2003-11-25 → cancelled 2015-12-22
- Marro, Robert E RI2017-12-22 active