Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KL7O callsign genealogy
Currently held by O DAY, DENNIS J
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 KL7O's current licensee, walking backwards.
- Helm, MatthewAKgranted 2026-06-17cancelled 2026-09-11
Successor callsigns
Callsigns held now by people who previously held KL7O.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KL7O, oldest first.
- O DAY, DENNIS J CO2014-06-17 → cancelled 2026-08-26
- Helm, Matthew AK2026-09-11 active