Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD0ISU callsign genealogy
Currently held by Howell, Michael D
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 KD0ISU's current licensee, walking backwards.
- Howell, Michael DIAgranted 2009-01-16cancelled 2009-02-21
Successor callsigns
Callsigns held now by people who previously held KD0ISU.
No current licensee on record previously held this callsign.