Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4MMZ callsign genealogy
Currently held by Langbert, Richard 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 K4MMZ's current licensee, walking backwards.
- MOUA, SHOUA MGAgranted 2020-10-06cancelled 2020-10-24
Successor callsigns
Callsigns held now by people who previously held K4MMZ.
- Langbert, Richard ECAgranted 2025-03-22
All historical holders
Every license row we've seen with the callsign K4MMZ, oldest first.
- Langbert, Richard E FL2013-09-07 → cancelled 2015-06-19
- MOUA, SHOUA M GA2020-10-24 active