Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4MMW callsign genealogy
Currently held by THOMSON, RANDALL 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 K4MMW's current licensee, walking backwards.
- Alford, Warren LALgranted 2009-12-07cancelled 2017-12-19
Successor callsigns
Callsigns held now by people who previously held K4MMW.
- THOMSON, RANDALL WTXgranted 2018-12-15
All historical holders
Every license row we've seen with the callsign K4MMW, oldest first.
- Alford, Warren L AL2017-12-19 active
- THOMSON, RANDALL W— → cancelled 1999-03-11