Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KO4TM callsign genealogy
Currently held by OTM AMATEUR RADIO 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 KO4TM's current licensee, walking backwards.
- KJ4ZTHcancelledOTM AMATEUR RADIO CLUBALgranted 2011-01-07cancelled 2011-01-25
Successor callsigns
Callsigns held now by people who previously held KO4TM.
No current licensee on record previously held this callsign.