Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4SZ callsign genealogy
Currently held by LEAR, ROBERT S
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 K4SZ's current licensee, walking backwards.
- Balaun, Matthew RGAgranted 2003-05-30cancelled 2008-11-21
Successor callsigns
Callsigns held now by people who previously held K4SZ.
- LEAR, ROBERT SGAgranted 2016-09-24
All historical holders
Every license row we've seen with the callsign K4SZ, oldest first.
- LEAR, ROBERT S GA1996-11-26 → cancelled 2006-10-31
- Balaun, Matthew R GA2018-09-13 active