Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N3OZS callsign genealogy
Currently held by MARKLE SR, FREDERICK N
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 N3OZS's current licensee, walking backwards.
- Markle III, Frederick NPAgranted 2005-04-04cancelled 2005-06-21
Successor callsigns
Callsigns held now by people who previously held N3OZS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N3OZS, oldest first.
- MARKLE SR, FREDERICK N MD1993-05-18 → cancelled 2005-05-19
- Markle III, Frederick N PA2025-04-08 active