Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W3OO callsign genealogy
Currently held by KIRSCHBAUM, CARL
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 W3OO's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W3OO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W3OO, oldest first.
- KIRSCHBAUM, CARL PA1996-04-02 → cancelled 2000-10-17
- MOSKAL, MICHAEL J PA2012-02-22 → cancelled 2024-03-28
- Starr, Lee D CO2024-04-16 active