Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K6MPH callsign genealogy
Currently held by SOUTHERN CALIFORNIA GAS COMPANY RADIO CLUB
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 K6MPH's current licensee, walking backwards.
- Harder, Maxwell PCOgranted 2015-10-19cancelled 2015-11-20
Successor callsigns
Callsigns held now by people who previously held K6MPH.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K6MPH, oldest first.
- SOUTHERN CALIFORNIA GAS COMPANY RADIO CLUB CA1997-05-29 → cancelled 2008-08-16
- Harder, Maxwell P CO2025-11-22 active