Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K6ZTM callsign genealogy
Currently held by BLACKBURN, ROBERT 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 K6ZTM's current licensee, walking backwards.
- STAATS, WILLIAM HCAgranted 2011-07-12cancelled 2020-11-10
Successor callsigns
Callsigns held now by people who previously held K6ZTM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K6ZTM, oldest first.
- BLACKBURN, ROBERT B CA2004-12-18 → cancelled 2017-03-15
- STAATS, WILLIAM H CA2020-11-10 active