Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K8MRT callsign genealogy
Currently held by HARRIS, WILLIAM G
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 K8MRT's current licensee, walking backwards.
- Seper, Karl WMIgranted 2007-07-06cancelled 2015-06-30
Successor callsigns
Callsigns held now by people who previously held K8MRT.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K8MRT, oldest first.
- HARRIS, WILLIAM G WV2001-11-28 → cancelled 2014-02-26
- Seper, Karl W MI2025-04-22 active