Robtex

Up: 6.0.0.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 6.0.0.0/23
Down right: 6.0.2.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
6.0.0.0	A	6k5b.com
6.0.0.0	A	dioni.dyndns.org
6.0.0.0	A	commonlibs--wks--win--x86.v1.bdnsrt.org
6.0.0.10	A+PTR	test610.army.mil
6.0.0.14	A+PTR	testhost.army.mil
6.0.0.15	A+PTR	test15.army.mil
6.0.0.16	A+PTR	1234.army.mil
6.0.0.39	PTR	test39.yuma.army.mil
6.0.0.40	PTR	test40.yuma.army.mil
6.0.0.41	PTR	test41.yuma.army.mil
6.0.2.2	A	vcenter.yuma.army.mil