Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K1WMM callsign genealogy
Currently held by Morris, William 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 K1WMM's current licensee, walking backwards.
- MALUMPHY, WILLIAM MMAgranted 2025-09-16
Successor callsigns
Callsigns held now by people who previously held K1WMM.
All historical holders
Every license row we've seen with the callsign K1WMM, oldest first.
- Morris, William M MA2016-08-02 → cancelled 2016-12-09
- MALUMPHY, WILLIAM M MA2025-08-19 → cancelled 2025-09-16