Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4MTS callsign genealogy
Currently held by GRAVES, FREDERICK D
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 W4MTS's current licensee, walking backwards.
- White, Michael SNCgranted 2007-10-19cancelled 2007-11-09
Successor callsigns
Callsigns held now by people who previously held W4MTS.
- GRAVES, FREDERICKFLgranted 2023-01-25
All historical holders
Every license row we've seen with the callsign W4MTS, oldest first.
- GRAVES, FREDERICK D FL1997-05-09 → cancelled 2003-03-04
- WHITE, MICHAEL S NC2017-08-14 active