Robtex

Up: 216.21.224.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 216.21.225.0/25
Down right: 216.21.225.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.21.225.17	PTR	pdns2.register.com
216.21.225.17	A	srv2-ascensia.ma
216.21.225.17	A	srv2-lasenzagirl.ma
216.21.225.18	PTR	dns02.ebrandsecure.net
216.21.225.19	PTR	ns2.netsearchers.com
216.21.225.20	PTR	dns2.cscdns.net