Robtex

Up: 216.106.216.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 216.106.216.0/23
Down right: 216.106.218.0/23

IP	Type	Hostname
216.106.216.0	A+PTR	0.216.106.216.unassigned.sdncommunications.com
216.106.216.1	A+PTR	1.216.106.216.unassigned.sdncommunications.com
216.106.216.14	A+PTR	14.216.106.216.unassigned.sdncommunications.com
216.106.216.54	A	54.216.106.216.unassigned.sdncommunications.com
216.106.216.136	PTR	136.216.106.216.unassigned.sdncommunications.com
216.106.216.203	PTR	203.216.106.216.unassigned.sdncommunications.com
216.106.217.0	A+PTR	0.217.106.216.unassigned.sdncommunications.com
216.106.217.7	PTR	7.217.106.216.unassigned.sdncommunications.com
216.106.217.50	PTR	dsl.valley.104398.sxflsdch39r.sdnet.net
216.106.217.79	PTR	dsl.valley.104398.sxflsdch39r.sdnet.net
216.106.217.91	A+PTR	91.217.106.216.unassigned.sdncommunications.com
216.106.217.122	PTR	dsl.valley.104398.sxflsdch39r.sdnet.net
216.106.217.141	A	141.217.106.216.unassigned.sdncommunications.com
216.106.217.146	PTR	dsl.valley.104398.sxflsdch39r.sdnet.net
216.106.217.152	A+PTR	152.217.106.216.unassigned.sdncommunications.com
216.106.217.156	PTR	dsl.valley.104398.sxflsdch39r.sdnet.net
216.106.218.0	A+PTR	0.218.106.216.unassigned.sdncommunications.com
216.106.218.15	PTR	15.218.106.216.unassigned.sdncommunications.com
216.106.218.15	A	mbandy.asuscomm.com
216.106.218.142	PTR	142.218.106.216.unassigned.sdncommunications.com
216.106.219.0	A+PTR	0.219.106.216.unassigned.sdncommunications.com
216.106.219.44	PTR	dsl.valley.104398.sxflsdch39r.sdnet.net
216.106.219.47	PTR	47.219.106.216.unassigned.sdncommunications.com
216.106.219.58	PTR	dsl.valley.104398.sxflsdch39r.sdnet.net
216.106.219.190	PTR	dsl.valley.104398.sxflsdch39r.sdnet.net
216.106.219.198	PTR	198.219.106.216.unassigned.sdncommunications.com
216.106.219.202	PTR	202.219.106.216.unassigned.sdncommunications.com
216.106.219.231	A+PTR	231.219.106.216.unassigned.sdncommunications.com