Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WW6HAM callsign genealogy
Currently held by O'Riordan, David B
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 WW6HAM's current licensee, walking backwards.
- O RIORDAN, DAVID BCAgranted 1993-10-19cancelled 2003-07-15
Successor callsigns
Callsigns held now by people who previously held WW6HAM.
- O'Riordan, David BMOgranted 2024-05-10
All historical holders
Every license row we've seen with the callsign WW6HAM, oldest first.
- SOUTHERN CALIFORNIA ARC CA1996-11-04 → cancelled 2000-11-03
- O'Riordan, David B MO2023-08-25 → cancelled 2024-05-10