Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K6UPS callsign genealogy
Currently held by Slack, William C
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 K6UPS's current licensee, walking backwards.
- Slack, William CCAgranted 2012-03-01cancelled 2012-05-25
Successor callsigns
Callsigns held now by people who previously held K6UPS.
No current licensee on record previously held this callsign.