Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB6TWZ callsign genealogy
Currently held by LATHAM, MARK A
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 KB6TWZ's current licensee, walking backwards.
- Latham, Mark ACOgranted 2023-12-23cancelled 2024-01-13
Successor callsigns
Callsigns held now by people who previously held KB6TWZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB6TWZ, oldest first.
- LATHAM, MARK A CA1987-09-15 → cancelled 1999-09-16
- Latham, Mark A CO2024-01-13 active