Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4ZUM callsign genealogy
Currently held by Slagle, Timothy G
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 K4ZUM's current licensee, walking backwards.
- Slagle, Timothy GSCgranted 2023-04-28cancelled 2023-05-16
Successor callsigns
Callsigns held now by people who previously held K4ZUM.
No current licensee on record previously held this callsign.