Confidence: Medium · Source: FCC ULS · As of 2026-09-11
KB4ERT callsign genealogy
Currently held by SAKAI, JOHN K
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 KB4ERT's current licensee, walking backwards.
- BOLTON JR, BERT ISCgranted 2000-06-03cancelled 2001-06-08
Successor callsigns
Callsigns held now by people who previously held KB4ERT.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB4ERT, oldest first.
- SAKAI, JOHN K VA1987-12-29 → cancelled 1999-12-30
- BOLTON JR, BERT I SC2021-05-05 active