Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KO7JRO callsign genealogy
Currently held by OPFER, JACOB
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 KO7JRO's current licensee, walking backwards.
- OPFER, JACOBMTgranted 2019-09-10cancelled 2019-10-01
Successor callsigns
Callsigns held now by people who previously held KO7JRO.
No current licensee on record previously held this callsign.