Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WL7COO callsign genealogy
Currently held by Sohn, Daniel
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 WL7COO's current licensee, walking backwards.
- Sohn, DanielCAgranted 2005-05-27cancelled 2005-06-18
Successor callsigns
Callsigns held now by people who previously held WL7COO.
- Sohn, DanielCAgranted 2005-05-27cancelled 2005-06-18
All historical holders
Every license row we've seen with the callsign WL7COO, oldest first.
- SOHN, DANIEL CA1999-01-27 → cancelled 2000-06-03
- Sohn, Daniel CA2025-03-25 active