Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9OS callsign genealogy
Currently held by OTWELL, STEVEN D
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 K9OS's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held K9OS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9OS, oldest first.
- OTWELL, STEVEN D IL2007-08-23 → cancelled 2019-08-24
- Stevenson, Orlando L NE2019-09-13 active