Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4ULL callsign genealogy
Currently held by PETRAKIS, THOMAS K
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 K4ULL's current licensee, walking backwards.
- Petrakis, Thomas KNVgranted 2004-10-19cancelled 2008-04-18
Successor callsigns
Callsigns held now by people who previously held K4ULL.
- PETRAKIS, THOMAS KOKgranted 2018-12-28