Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W8CSI callsign genealogy
Currently held by SINCOCK, JOHN P
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 W8CSI's current licensee, walking backwards.
- Cain, Phillip WOHgranted 2017-04-21cancelled 2017-06-20
Successor callsigns
Callsigns held now by people who previously held W8CSI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W8CSI, oldest first.
- SINCOCK, JOHN P MI1994-12-16 → cancelled 1998-07-06
- Cain, Phillip W OH2017-06-20 active