Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N4TDT callsign genealogy
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 N4TDT's current licensee, walking backwards.
- CRETE, RANDALL JFLgranted 2020-09-28cancelled 2020-10-17
Successor callsigns
Callsigns held now by people who previously held N4TDT.
- CASTLEBERRY JR, WLLIAM MGAgranted 2018-01-05
All historical holders
Every license row we've seen with the callsign N4TDT, oldest first.
- CRETE, RANDALL J FL2020-10-17 active
- —— → cancelled 1998-01-14