Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W3OBX callsign genealogy
Currently held by Mason, Thomas R
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 W3OBX's current licensee, walking backwards.
- Mason, Thomas RMDgranted 2021-11-08cancelled 2023-05-13
Successor callsigns
Callsigns held now by people who previously held W3OBX.
- FRIEND, DONALD FMDgranted 2021-04-23
All historical holders
Every license row we've seen with the callsign W3OBX, oldest first.
- FRIEND, DONALD F MD2019-12-31 → cancelled 2021-04-23
- Mason, Thomas R MD2023-05-13 active