Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K8ZAM callsign genealogy
Currently held by COLBY, CARL F
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 K8ZAM's current licensee, walking backwards.
- Colby, Leean JMIgranted 2016-07-07cancelled 2016-11-26
Successor callsigns
Callsigns held now by people who previously held K8ZAM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K8ZAM, oldest first.
- COLBY, CARL F MI2007-10-04 → cancelled 2014-12-03
- Colby, Leean J MI2016-11-26 active