Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KK4ELM callsign genealogy
Currently held by Mrozkowski, Daniel C
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 KK4ELM's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KK4ELM.
- Davis, Clayton DVAgranted 2022-10-12
All historical holders
Every license row we've seen with the callsign KK4ELM, oldest first.
- Davis, Clayton D AL2011-10-03 → cancelled 2012-03-10
- Mrozkowski, Daniel C NC2024-05-07 active