Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4MOP callsign genealogy
Currently held by Hacker, Leonard D
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 K4MOP's current licensee, walking backwards.
- Hacker, Leonard DFLgranted 2014-01-09cancelled 2016-02-13
Successor callsigns
Callsigns held now by people who previously held K4MOP.
- Hacker, Leonard DGAgranted 2016-02-13cancelled 2017-02-28