Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4ESJ callsign genealogy
Currently held by ROOT, MICHAEL P
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 W4ESJ's current licensee, walking backwards.
- ROOT, MICHAEL PFLgranted 2010-03-05cancelled 2010-04-13
Successor callsigns
Callsigns held now by people who previously held W4ESJ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4ESJ, oldest first.
- ROOT, RICHARD L FL1998-02-03 → cancelled 2010-02-04
- ROOT, MICHAEL P FL2020-04-10 active