Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WA4MMS callsign genealogy
Currently held by Kruk, Ronald E
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 WA4MMS's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held WA4MMS.
- Kruk, Ronald ENCgranted 2007-02-09cancelled 2011-10-18
All historical holders
Every license row we've seen with the callsign WA4MMS, oldest first.
- Kruk, Ronald E NC2001-06-26 → cancelled 2007-02-09
- Kruk, Ronald E NC2011-10-18 → cancelled 2023-10-19