Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KT4DS callsign genealogy
Currently held by WHALEN, ERVIN E
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 KT4DS's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KT4DS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KT4DS, oldest first.
- WHALEN, ERVIN E CO2001-07-13 → cancelled 2007-12-12
- Sullivan, Dwight D FL2025-12-09 active