Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WB9YOJ callsign genealogy
Currently held by Mitzenmacher, Mark B
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 WB9YOJ's current licensee, walking backwards.
- Mitzenmacher, Mark BTXgranted 2020-06-05cancelled 2020-06-23
Successor callsigns
Callsigns held now by people who previously held WB9YOJ.
No current licensee on record previously held this callsign.