Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD4MMS callsign genealogy
Currently held by HEDRICK, BILLY R
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 KD4MMS's current licensee, walking backwards.
- KN4FBTcancelledMonrovia Middle School ARCALgranted 2017-08-08cancelled 2017-08-29
Successor callsigns
Callsigns held now by people who previously held KD4MMS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD4MMS, oldest first.
- HEDRICK, BILLY R NC2002-01-24 → cancelled 2014-04-08
- Monrovia Middle School ARC AL2017-08-29 active