Robtex

Up: 72.44.238.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 72.44.239.0/25
Down right: 72.44.239.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.44.239.4	PTR	ip-72-44-239-4.iodatacenters.com
72.44.239.4	A	ns2.certona.net
72.44.239.4	A	ns2.certona.com
72.44.239.6	PTR	ip-72-44-239-6.iodatacenters.com
72.44.239.6	A	ris.res-x.com
72.44.239.69	PTR	ip-72-44-239-69.iodatacenters.com
72.44.239.69	A	ns2.sambreel.org
72.44.239.69	A	ns2.sambreel.info
72.44.239.70	PTR	ip-72-44-239-70.iodatacenters.com