Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4TIA callsign genealogy
Currently held by Oberdorfer, Martha L
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 KO4TIA's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KO4TIA.
- Oberdorfer, Martha LFLgranted 2021-10-05