Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W7ULZ callsign genealogy
Currently held by Osterman, John O
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 W7ULZ's current licensee, walking backwards.
- Osterman, John OAZgranted 2015-11-02cancelled 2016-07-08
Successor callsigns
Callsigns held now by people who previously held W7ULZ.
No current licensee on record previously held this callsign.