systemd-networkd now implements a resolve hook for its internal DHCP
server, so that the hostnames tracked in DHCP leases can be resolved
locally. This is now enabled by default for the DHCP server running
on the host side of local systemd-nspawn or systemd-vmspawn networks.
Hooray.local
Short spacex is the only answer I've heard but I'm wise enough to know I don't have the mentality for derivatives.