Robtex

Up: 161.81.4.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 161.81.4.0/24
Down right: 161.81.5.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
161.81.5.10	A+PTR	mail.tandbergdata.com
161.81.5.10	A	sherman.exabyte.com
161.81.5.10	A	mail.exabyte.com
161.81.5.11	PTR	mail2.tandbergdata.com
161.81.5.50	A+PTR	advantage.exabyte.com
161.81.5.62	A	outlook.exabyte.com
161.81.5.81	A	survey.exabyte.com
161.81.5.200	A	3005.exabyte.com