Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4JJL callsign genealogy
Currently held by LAMBERT, JOHN J
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 K4JJL's current licensee, walking backwards.
- LAMBERT, JOHN JGAgranted 1996-11-04cancelled 2000-12-09
Successor callsigns
Callsigns held now by people who previously held K4JJL.
No current licensee on record previously held this callsign.