Robtex

Up: 72.34.160.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 72.34.168.0/22
Down right: 72.34.172.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.34.168.38	A+PTR	app-mx001.na3.netsuite.com
72.34.168.39	A+PTR	app-mx002.na3.netsuite.com
72.34.168.75	A	nmail001.na3.netsuite.com
72.34.168.76	A+PTR	nmail002.na3.netsuite.com
72.34.169.10	A+PTR	checkout.na3.netsuite.com
72.34.169.10	A	raisingcanesgear.com
72.34.169.13	A	corkstore.na3.securedcheckout.com
72.34.169.17	PTR	shopping.na3.netsuite.com
72.34.169.17	A	rockywoods.com
72.34.169.17	A	flowertrading.com
72.34.169.22	PTR	forms.na3.netsuite.com
72.34.169.29	A+PTR	content.na3.netsuite.com
72.34.169.34	A	connect2.api.source.na3.netsuite.com
72.34.169.149	A+PTR	email.source.na3.netsuite.com
72.34.169.151	A+PTR	suitetalk.api.source.na3.netsuite.com
72.34.169.153	A+PTR	extforms.source.na3.netsuite.com
72.34.169.155	A+PTR	app.source.na3.netsuite.com
72.34.169.156	A+PTR	system2.na3.netsuite.com
72.34.170.61	PTR	72-34-170-61.sd.netsuite.com
72.34.170.62	A+PTR	72-34-170-62.sd.netsuite.com
72.34.170.62	A	antaira.es
72.34.170.63	A+PTR	72-34-170-63.sd.netsuite.com
72.34.170.63	A	hpeco.com
72.34.170.64	A+PTR	72-34-170-64.sd.netsuite.com
72.34.170.64	A	durachoice.com
72.34.170.65	A+PTR	72-34-170-65.sd.netsuite.com
72.34.170.66	A	candywarehouse.com
72.34.170.67	PTR	72-34-170-67.sd.netsuite.com
72.34.170.74	A+PTR	72-34-170-74.sd.netsuite.com
72.34.170.77	A+PTR	72-34-170-77.sd.netsuite.com
72.34.170.79	A+PTR	72-34-170-79.sd.netsuite.com
72.34.170.79	A	scoutdesignstudio.com
72.34.170.80	A+PTR	72-34-170-80.sd.netsuite.com
72.34.170.83	A+PTR	72-34-170-83.sd.netsuite.com
72.34.170.84	A+PTR	170-84.sd.netsuite.com
72.34.170.84	A	72-34-170-84.sd.netsuite.com
72.34.170.88	A+PTR	72-34-170-88.sd.netsuite.com
72.34.170.183	A+PTR	72-34-170-183.sd.netsuite.com
72.34.170.189	A+PTR	72-34-170-189.sd.netsuite.com
72.34.170.234	A+PTR	72-34-170-234.sd.netsuite.com
72.34.170.253	A+PTR	170-253.sd.netsuite.com
72.34.174.41	A	mail.cconvert.com