Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K5SIS callsign genealogy
Currently held by SCHILLING, MARY K
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 K5SIS's current licensee, walking backwards.
- Wilson, John ATXgranted 2006-07-28cancelled 2009-01-23
Successor callsigns
Callsigns held now by people who previously held K5SIS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K5SIS, oldest first.
- SCHILLING, MARY K CA1996-01-29 → cancelled 2008-01-30
- Wilson, John A TX2018-11-29 active