Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4IOD callsign genealogy
Currently held by HOOK, JOHN A
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 K4IOD's current licensee, walking backwards.
- Glaeser, Wolf DieterORgranted 2020-08-18cancelled 2020-09-05
Successor callsigns
Callsigns held now by people who previously held K4IOD.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4IOD, oldest first.
- HOOK, JOHN A FL2005-08-03 → cancelled 2017-11-01
- Glaeser, Wolf Dieter ID2020-09-05 active