Robtex

Up: 216.168.4.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 216.168.4.0/25
Down right: 216.168.4.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.168.4.130	A+PTR	news.supernews.com
216.168.4.130	A	news.us.supernews.com
216.168.4.130	A	sn-indi.vsrv-sjc.supernews.net
216.168.4.134	A+PTR	www.supernews.com
216.168.4.134	A	supernews.us
216.168.4.134	A	supernews.net
216.168.4.144	PTR	sn-ip.us.supernews.com
216.168.4.144	A	news.comp-unltd.com
216.168.4.144	A	news2.widomaker.com
216.168.4.150	A	supernews.sonic.net
216.168.4.150	A	corp-radius.supernews.com
216.168.4.150	A	corp-radius.supernews.net
216.168.4.158	A+PTR	reseller.us.supernews.com
216.168.4.166	A+PTR	ia.us.supernews.com
216.168.4.166	A	library.airnews.net
216.168.4.170	A+PTR	earthlink.us.supernews.com
216.168.4.170	A	earthlink.vsrv-sjc.supernews.net