Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4OQ callsign genealogy
Currently held by HAUNSCHILD, MAHLON R
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 K4OQ's current licensee, walking backwards.
- Razvan, KamranVAgranted 2025-02-11cancelled 2025-05-10
Successor callsigns
Callsigns held now by people who previously held K4OQ.
All historical holders
Every license row we've seen with the callsign K4OQ, oldest first.
- HAUNSCHILD, MAHLON R FL2020-10-28 → cancelled 2023-04-21
- Razvan, Kamran VA2025-05-10 active
- —— → cancelled 1998-12-17