Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1DTH callsign genealogy
Currently held by Ciaio, Michael 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 W1DTH's current licensee, walking backwards.
- Ciaio, Michael JPAgranted 2011-08-11cancelled 2011-09-16
Successor callsigns
Callsigns held now by people who previously held W1DTH.
No current licensee on record previously held this callsign.