Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KM5M callsign genealogy
Currently held by SHEFFIELD, JAMES W
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 KM5M's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KM5M.
- THOMIN, LAURENT DTXgranted 2023-04-01
All historical holders
Every license row we've seen with the callsign KM5M, oldest first.
- THOMIN, LAURENT D TX1997-12-10 → cancelled 2003-05-20
- SHEFFIELD, JAMES W TX2025-05-30 active