Robtex

Up: 72.52.70.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 72.52.71.0/25
Down right: 72.52.71.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.52.71.1	A	dns2.firehouse.net
72.52.71.1	A	ns1.isc-sns.net
72.52.71.2	PTR	w.arin.net
72.52.71.3	A	tld.isc-sns.com
72.52.71.3	A	ns2-isc.registry.qa
72.52.71.3	A	k.registry.qa
72.52.71.4	PTR	a.nic.so
72.52.71.4	A	ns1.gmoregistry.net
72.52.71.5	A	ns102.isc-sns.com
72.52.71.5	A	ns101.isc-sns.info
72.52.71.6	A	att.isc-sns.info
72.52.71.6	A	att.isc-sns.com
72.52.71.7	A	osag.isc-sns.com
72.52.71.7	A	osag.isc-sns.info
72.52.71.7	A	sns3.open.ch