Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KA5OSF callsign genealogy
Currently held by Mackus, Michael 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 KA5OSF's current licensee, walking backwards.
- Mackus, Michael JTXgranted 2026-05-05cancelled 2026-05-23
Successor callsigns
Callsigns held now by people who previously held KA5OSF.
No current licensee on record previously held this callsign.