Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NB0O callsign genealogy
Currently held by Marks, Andrew L
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 NB0O's current licensee, walking backwards.
- Marks, Andrew LCAgranted 2011-10-07cancelled 2011-11-29
Successor callsigns
Callsigns held now by people who previously held NB0O.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NB0O, oldest first.
- RULE, CURBY H MN1999-05-04 → cancelled 2011-05-05
- Marks, Andrew L CA2021-09-17 active