Is this operated by Qantaslink or some other operator?
It is operated by QantasLink, however QantasLink is made up of:
Sunstate (Operating Dash8s in QLD)
Eastern (Operating Dash 8s in NSW, Vic, SA and now WA)
Network (Operating a few different types flying charter only in WA)
and Cobham who have the 717 Contract. (Operating in WA, NT? and now QLD)
QantasLink as an airline is just a shell for the above 4 operations.