Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4SRU callsign genealogy
Currently held by POSTON, BILL
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 KO4SRU's current licensee, walking backwards.
- Poston, BillSCgranted 2021-07-12cancelled 2021-08-19
Successor callsigns
Callsigns held now by people who previously held KO4SRU.
- Poston, William LSCgranted 2021-10-01cancelled 2022-09-30