Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4UBL callsign genealogy
Currently held by UBL, MICHAEL P
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 K4UBL's current licensee, walking backwards.
- UBL, MICHAEL Pcancelled 1999-07-27
Successor callsigns
Callsigns held now by people who previously held K4UBL.
- UBL, MICHAEL PFLgranted 2003-03-11cancelled 2015-03-12