Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4MM callsign genealogy
Currently held by COLYARD JR, THOMAS M
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 K4MM's current licensee, walking backwards.
- COLYARD JR, THOMAS MFLgranted 1999-04-15cancelled 2002-08-20
Successor callsigns
Callsigns held now by people who previously held K4MM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4MM, oldest first.
- MILLER, JOSEPH W VA1994-07-14 → cancelled 2000-07-08
- COLYARD JR, THOMAS M FL2022-12-08 active