Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KW4SW callsign genealogy
Currently held by Bolton, Timothy J
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 KW4SW's current licensee, walking backwards.
- Bolton, Timothy JALgranted 2020-12-07cancelled 2022-09-13
Successor callsigns
Callsigns held now by people who previously held KW4SW.
- Donegan, John ATNgranted 2026-04-17
All historical holders
Every license row we've seen with the callsign KW4SW, oldest first.
- Donegan, John A TN2016-02-09 → cancelled 2016-04-19
- Bolton, Timothy J AL2022-09-13 active