Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4DFO callsign genealogy
Currently held by O'Connor, David F
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 K4DFO's current licensee, walking backwards.
- O'Connor, David FFLgranted 2008-09-26cancelled 2008-10-17
Successor callsigns
Callsigns held now by people who previously held K4DFO.
No current licensee on record previously held this callsign.