Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N6COB callsign genealogy
Currently held by OBrien, Christopher 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 N6COB's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held N6COB.
- OBrien, Christopher ECAgranted 2022-07-15cancelled 2026-07-28
All historical holders
Every license row we've seen with the callsign N6COB, oldest first.
- MARTIN, MARVIN G AZ1996-05-08 → cancelled 2008-05-09
- OBrien, Christopher E CA2018-10-05 → cancelled 2022-07-15