Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N5OSJ callsign genealogy
Currently held by Klassy, Marcelino 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 N5OSJ's current licensee, walking backwards.
- Klassy, Marcelino ETXgranted 2011-01-19cancelled 2020-05-23
Successor callsigns
Callsigns held now by people who previously held N5OSJ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N5OSJ, oldest first.
- MACIAS, MARCELINO B TX1989-12-26 → cancelled 2002-03-07
- Klassy, Marcelino E TX2020-05-23 active