Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WD0AOI callsign genealogy
Currently held by LADEWIG, EARL
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 WD0AOI's current licensee, walking backwards.
- LADEWIG, HARRY WCOgranted 2016-05-03cancelled 2020-12-15
Successor callsigns
Callsigns held now by people who previously held WD0AOI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WD0AOI, oldest first.
- LADEWIG, EARL CO2014-06-03 → cancelled 2019-01-08
- LADEWIG, HARRY W CO2020-12-15 active