Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC0STL callsign genealogy
Currently held by Lambert 213, Stephen T
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 KC0STL's current licensee, walking backwards.
- LAMBERT, STEPHEN TMOgranted 2008-06-03cancelled 2008-07-11
Successor callsigns
Callsigns held now by people who previously held KC0STL.
- Hummert, Bryan PMOgranted 2004-04-20cancelled 2008-01-04
All historical holders
Every license row we've seen with the callsign KC0STL, oldest first.
- Hummert, Bryan P MO2002-03-07 → cancelled 2004-04-20
- Lambert 213, Stephen T MO2018-04-17 active