  We study $5d$ gauge theories that go in the UV to $6d$ $\mathcal{N}$$=(1,0)$
SCFT. We focus on these theories that can be engineered in string theory by
brane webs. Given a theory in this class, we propose a method to determine the
$6d$ SCFT it goes to. We also discuss the implication of this to the
compactification of the resulting $6d$ SCFT on a torus to $4d$. We test and
demonstrate this method with a variety of examples.
