Robtex

Up: 198.136.162.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 198.136.163.0/25
Down right: 198.136.163.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
198.136.163.21	PTR	hcupnet.l1.adass.hosted.s-3.net
198.136.163.22	PTR	meps.l1.adass.hosted.s-3.net
198.136.163.32	PTR	admin.pcpgroup.s-3.net
198.136.163.50	PTR	dns1.s-3.com
198.136.163.50	PTR	l8gp8092.s-3.com
198.136.163.57	PTR	support.actgnetwork.org
198.136.163.73	PTR	aactg.com
198.136.163.73	A+PTR	actgnetwork.com
198.136.163.73	A+PTR	aactg.net
198.136.163.86	PTR	s-3.com
198.136.163.86	PTR	infinibyte.net
198.136.163.86	A+PTR	s-3.net
198.136.163.100	PTR	nirc.qa.s-3.net
198.136.163.103	PTR	infinibyte.com
198.136.163.103	PTR	tvtassociates.com
198.136.163.126	A+PTR	list.s-3.com
198.136.163.130	A	fluresearch.net
198.136.163.130	A	fluresearch.org
198.136.163.154	A+PTR	diabetes-in-america.s-3.com
198.136.163.164	A	pactg.s-3.com
198.136.163.165	A+PTR	cpcra.s-3.com
198.136.163.192	A+PTR	daitrmc.s-3.com
198.136.163.193	A+PTR	townhallmeeting.s-3.net
198.136.163.199	A+PTR	impsitedevelopment.s-3.net
198.136.163.200	PTR	hcupnet.s-3.com
198.136.163.227	A+PTR	tchari.org
198.136.163.236	A	gtrp.org