Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W6MOO callsign genealogy
Currently held by Ammermann, Ernest Paul Henry C
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 W6MOO's current licensee, walking backwards.
- Costello, JasonTXgranted 2026-05-27cancelled 2026-06-19
Successor callsigns
Callsigns held now by people who previously held W6MOO.
- Ammermann, Ernest Paul Henry CCAgranted 2024-02-06
All historical holders
Every license row we've seen with the callsign W6MOO, oldest first.
- TINTI, JAY A CA1994-05-24 → cancelled 2006-05-25
- Ammermann, Ernest Paul Henry C CA2016-12-23 → cancelled 2024-02-06
- Costello, Jason TX2026-06-19 active