Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WB4STU callsign genealogy
Currently held by Kolb, Robert
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 WB4STU's current licensee, walking backwards.
- Kolb, RobertNCgranted 2024-10-18cancelled 2024-11-05
Successor callsigns
Callsigns held now by people who previously held WB4STU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WB4STU, oldest first.
- PENDERGRASS, JEAN G NC2002-10-23 → cancelled 2015-01-06
- Kolb, Robert NC2024-11-05 active