Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4EFO callsign genealogy
Currently held by Smith, Mark V
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 W4EFO's current licensee, walking backwards.
- Smith, Mark VFLgranted 2020-11-19cancelled 2020-12-11
Successor callsigns
Callsigns held now by people who previously held W4EFO.
No current licensee on record previously held this callsign.