Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KC4YDD callsign genealogy
Currently held by THOMAS, WILLIAM D
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 KC4YDD's current licensee, walking backwards.
- Thomas, William DTNgranted 2018-08-21cancelled 2018-09-12
Successor callsigns
Callsigns held now by people who previously held KC4YDD.
- Thomas, William DTNgranted 2020-03-21cancelled 2024-02-23
All historical holders
Every license row we've seen with the callsign KC4YDD, oldest first.
- THOMAS, WILLIAM D TN2001-01-17 → cancelled 2013-03-28
- Thomas, William D TN2018-09-12 → cancelled 2020-03-21