Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4NFA callsign genealogy
Currently held by OBrien, Michael 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 K4NFA's current licensee, walking backwards.
- OBrien, Michael CVAgranted 2006-10-16cancelled 2008-07-18
Successor callsigns
Callsigns held now by people who previously held K4NFA.
No current licensee on record previously held this callsign.