Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W1ZYX callsign genealogy
Currently held by Grondalski, Kyle 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 W1ZYX's current licensee, walking backwards.
- Grondalski, Kyle TMAgranted 2020-10-22cancelled 2020-11-20
Successor callsigns
Callsigns held now by people who previously held W1ZYX.
- Herd, Clifford LNEgranted 2019-04-23
All historical holders
Every license row we've seen with the callsign W1ZYX, oldest first.
- SLUSHER, WILLIAM E MA1996-02-05 → cancelled 2008-02-06
- Herd, Clifford L NE2008-06-07 → cancelled 2009-06-19
- Grondalski, Kyle T MA2020-11-20 active