Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K3MPZ callsign genealogy
Currently held by HAIRSINE, RALPH L
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 K3MPZ's current licensee, walking backwards.
- ZIMRING, MICHAEL PMDgranted 2019-11-04cancelled 2019-11-26
Successor callsigns
Callsigns held now by people who previously held K3MPZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K3MPZ, oldest first.
- HAIRSINE, RALPH L DE2005-11-02 → cancelled 2017-12-01
- ZIMRING, MICHAEL P MD2019-11-26 active