Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K5MBT callsign genealogy
Currently held by TREUBIG, MARK B
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 K5MBT's current licensee, walking backwards.
- TREUBIG, MARK BLAgranted 1991-11-26cancelled 2000-08-05
Successor callsigns
Callsigns held now by people who previously held K5MBT.
No current licensee on record previously held this callsign.