Robtex

Up: 216.237.34.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 216.237.34.0/25
Down right: 216.237.34.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.237.34.4	PTR	mx1.blizzard.com
216.237.34.5	PTR	mx2.blizzard.com
216.237.34.6	PTR	mx3.blizzard.com
216.237.34.21	A+PTR	216-237-34-21.static-ip.telepacific.net
216.237.34.21	A	satena.com.co
216.237.34.21	A	simsweetie.com