Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KU1Z callsign genealogy
Currently held by Rozyn, Marc P
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 KU1Z's current licensee, walking backwards.
- Rozyn, Marc PCTgranted 2013-12-16cancelled 2014-03-29
Successor callsigns
Callsigns held now by people who previously held KU1Z.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KU1Z, oldest first.
- Black, Ned ME2001-10-30 → cancelled 2013-12-05
- Rozyn, Marc P TX2024-04-23 active