Confidence: Medium · Source: FCC ULS · As of 2026-10-24
W0OPA callsign genealogy
Currently held by Janning, Mark
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 W0OPA's current licensee, walking backwards.
- Janning, MarkMNgranted 2026-09-19cancelled 2026-10-09
Successor callsigns
Callsigns held now by people who previously held W0OPA.
No current licensee on record previously held this callsign.