Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4SRS callsign genealogy
Currently held by BLACK JR, WILLIAM M
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 K4SRS's current licensee, walking backwards.
- SILK, SANDRA RFLgranted 1997-10-28cancelled 2005-07-08
Successor callsigns
Callsigns held now by people who previously held K4SRS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4SRS, oldest first.
- BLACK JR, WILLIAM M FL1987-10-20 → cancelled 1999-10-21
- SILK, SANDRA R FL2025-05-13 active