Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4XSS callsign genealogy
Currently held by KOLLENBAUM, HOLLY J
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 K4XSS's current licensee, walking backwards.
- Coberly, Tony CALgranted 2015-02-09cancelled 2020-05-29
Successor callsigns
Callsigns held now by people who previously held K4XSS.
- KOLLENBAUM, HOLLY JFLgranted 2016-12-07
All historical holders
Every license row we've seen with the callsign K4XSS, oldest first.
- KOLLENBAUM, HOLLY J FL2003-03-18 → cancelled 2006-12-27
- Coberly, Tony C AL2020-05-29 active