Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W2ATC callsign genealogy
Currently held by DILWORTH, DEREK J
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 W2ATC's current licensee, walking backwards.
- NIWA, HIROYUKIORgranted 2015-04-07cancelled 2015-05-29
Successor callsigns
Callsigns held now by people who previously held W2ATC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W2ATC, oldest first.
- DILWORTH, DEREK J NY1998-02-06 → cancelled 2010-02-09
- NIWA, HIROYUKI CA2025-05-21 active