Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC8RBT callsign genealogy
Currently held by Gruber, John W
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 KC8RBT's current licensee, walking backwards.
- Gruber, John WOHgranted 2000-08-11cancelled 2001-04-06
Successor callsigns
Callsigns held now by people who previously held KC8RBT.
No current licensee on record previously held this callsign.