Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KC9HSF callsign genealogy
Currently held by Finn, Mark L
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 KC9HSF's current licensee, walking backwards.
- Finn, Mark LWIgranted 2001-10-10cancelled 2005-05-31
Successor callsigns
Callsigns held now by people who previously held KC9HSF.
- Finn, Mark LWIgranted 2001-10-10cancelled 2013-10-11