Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K1YXP callsign genealogy
Currently held by Kowalski, Matthew W
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 K1YXP's current licensee, walking backwards.
- Kowalski, Matthew WNHgranted 2011-03-25cancelled 2011-04-15
Successor callsigns
Callsigns held now by people who previously held K1YXP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K1YXP, oldest first.
- NOUFEL, NASSERY T NH1987-10-06 → cancelled 1999-10-07
- Kowalski, Matthew W NH2021-01-20 active