Robtex

Up: 216.87.152.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 216.87.154.0/24
Down right: 216.87.155.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.87.154.33	A+PTR	pdns2.registrar-servers.com
216.87.154.33	PTR	c31.verisigndns.com
216.87.154.33	A+PTR	c3.verisigndns.com
216.87.155.33	PTR	dns1.namecheaphosting.com
216.87.155.33	PTR	dns1.registrar-servers.com
216.87.155.33	PTR	dns3.registrar-servers.com