Robtex

Up: 216.230.40.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 216.230.40.0/23
Down right: 216.230.42.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.230.40.42	A+PTR	216.230.40.42.host.smartcity.net
216.230.40.42	A	gregtesting.com
216.230.41.194	A	w4rnf.com
216.230.41.194	A	synergygaming.com
216.230.41.194	A	kn4nxr.com
216.230.41.195	PTR	216.230.41.195.host.smartcity.net
216.230.42.28	A+PTR	216.230.42.28.host.smartcity.net
216.230.42.57	A+PTR	216.230.42.57.host.smartcity.net