Robtex

Up: 50.82.40.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 50.82.40.0/23
Down right: 50.82.42.0/23

IP	Type	Hostname
50.82.40.1	PTR	50-82-40-1.client.mchsi.com
50.82.40.63	A+PTR	50-82-40-63.client.mchsi.com
50.82.40.82	PTR	50-82-40-82.client.mchsi.com
50.82.40.97	A+PTR	50-82-40-97.client.mchsi.com
50.82.40.187	A+PTR	50-82-40-187.client.mchsi.com
50.82.40.195	A+PTR	50-82-40-195.client.mchsi.com
50.82.41.208	A+PTR	50-82-41-208.client.mchsi.com
50.82.42.189	A+PTR	50-82-42-189.client.mchsi.com
50.82.42.189	A	rumsferd.com
50.82.43.205	A+PTR	50-82-43-205.client.mchsi.com
50.82.43.255	PTR	50-82-43-255.client.mchsi.com