Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4SEH callsign genealogy
Currently held by HALES, MARK 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 KO4SEH's current licensee, walking backwards.
- HALES, MARK DVAgranted 2018-05-09cancelled 2021-07-27
Successor callsigns
Callsigns held now by people who previously held KO4SEH.
- HALES, MARK DVAgranted 2026-03-07