Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4DOI callsign genealogy
Currently held by SMITH, CHARLES A
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 W4DOI's current licensee, walking backwards.
- DOI, ALAN JVAgranted 2015-07-07cancelled 2015-10-31
Successor callsigns
Callsigns held now by people who previously held W4DOI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4DOI, oldest first.
- SMITH, CHARLES A FL1996-09-05 → cancelled 2005-10-17
- DOI, ALAN J CA2025-08-20 active