Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4DUH callsign genealogy
Currently held by Frost, Shaun
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 W4DUH's current licensee, walking backwards.
- Frost, Shaun WCAgranted 2016-09-26cancelled 2017-12-09
Successor callsigns
Callsigns held now by people who previously held W4DUH.
No current licensee on record previously held this callsign.