Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4ZDC callsign genealogy
Currently held by Chirillo, Michael
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 W4ZDC's current licensee, walking backwards.
- Chirillo, MichaelVAgranted 2022-10-28cancelled 2022-11-15
Successor callsigns
Callsigns held now by people who previously held W4ZDC.
No current licensee on record previously held this callsign.