Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KN4WBT callsign genealogy
Currently held by Oliva, Mario 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 KN4WBT's current licensee, walking backwards.
- Oliva, Mario JGAgranted 2013-09-24cancelled 2019-08-01
Successor callsigns
Callsigns held now by people who previously held KN4WBT.
No current licensee on record previously held this callsign.