Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO1USA callsign genealogy
Currently held by SIMHADRI, ARUN KUMAR
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 KO1USA's current licensee, walking backwards.
- SIMHADRI, ARUN KUMARTNgranted 2020-11-04cancelled 2020-11-24
Successor callsigns
Callsigns held now by people who previously held KO1USA.
No current licensee on record previously held this callsign.