Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB3DFI callsign genealogy
Currently held by UNDERWOOD, THOMAS C
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 KB3DFI's current licensee, walking backwards.
- N3OLNcancelledcancelled 1998-11-25
Successor callsigns
Callsigns held now by people who previously held KB3DFI.
- UNDERWOOD, THOMAS CMDgranted 2018-04-20