Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO3O callsign genealogy
Currently held by CENTRAL MARYLAND DX CLUB
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 KO3O's current licensee, walking backwards.
- KC3ZSQcancelledCENTRAL MARYLAND DX CLUBMDgranted 2024-09-10cancelled 2024-10-22
Successor callsigns
Callsigns held now by people who previously held KO3O.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KO3O, oldest first.
- MONTEE, DAVID M FL2017-09-20 → cancelled 2022-10-03
- CENTRAL MARYLAND DX CLUB MD2024-10-22 active