Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9SIG callsign genealogy
Currently held by SAND, MICHAEL T
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 K9SIG's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held K9SIG.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9SIG, oldest first.
- BOLLWEG, JOHN J MI2005-03-24 → cancelled 2017-05-25
- SAND, MICHAEL T AZ2019-04-19 active