Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KK4DB callsign genealogy
Currently held by GREENFIELD, JOEL M
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 KK4DB's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KK4DB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KK4DB, oldest first.
- GREENFIELD, JOEL M FL1996-08-08 → cancelled 2008-08-09
- Greenfield, Joel FL2016-09-30 active