Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K2XS callsign genealogy
Currently held by HAMMELMANN, MARKUS
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 K2XS's current licensee, walking backwards.
- Biernacki, Terrence ANYgranted 2008-05-01cancelled 2009-04-28
Successor callsigns
Callsigns held now by people who previously held K2XS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K2XS, oldest first.
- HAMMELMANN, MARKUS OH1997-02-12 → cancelled 2009-02-13
- Biernacki, Terrence A NY2019-02-21 active