Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N9DO callsign genealogy
Currently held by HALPIN, GEORGE E
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 N9DO's current licensee, walking backwards.
- Schwarz, CharlesINgranted 2015-07-02cancelled 2019-08-20
Successor callsigns
Callsigns held now by people who previously held N9DO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N9DO, oldest first.
- HALPIN, GEORGE E IL2010-04-16 → cancelled 2017-07-31
- Schwarz, Charles IN2019-08-20 active