Robtex

Up: 50.81.160.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 50.81.160.0/24
Down right: 50.81.161.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
50.81.160.181	A+PTR	50-81-160-181.client.mchsi.com
50.81.161.82	PTR	50-81-161-82.client.mchsi.com
50.81.161.82	A	mail.holdinfinity.com
50.81.161.82	A	holdinfinity.net
50.81.161.188	A+PTR	50-81-161-188.client.mchsi.com