Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N1RRO callsign genealogy
Currently held by DONLON, JOHN F
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 N1RRO's current licensee, walking backwards.
- Opitz, ReinhardFLgranted 2024-03-21cancelled 2024-04-09
Successor callsigns
Callsigns held now by people who previously held N1RRO.
- DONLON, JOHN FCTgranted 2022-12-23
All historical holders
Every license row we've seen with the callsign N1RRO, oldest first.
- DONLON, JOHN F CT2004-01-14 → cancelled 2012-04-24
- Opitz, Reinhard R FL2024-04-09 active