Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4OLR callsign genealogy
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 N4OLR's current licensee, walking backwards.
- KOCH, GERALD FNCgranted 2019-05-21cancelled 2021-12-03
Successor callsigns
Callsigns held now by people who previously held N4OLR.
- KOCH, GERALD FNCgranted 2019-05-21cancelled 2021-12-03
All historical holders
Every license row we've seen with the callsign N4OLR, oldest first.
- KOCH, GERALD F NC2021-12-03 active
- —— → cancelled 1999-07-09