Robtex

Up: 216.240.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 216.240.16.0/23
Down right: 216.240.18.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.240.18.9	A+PTR	amnsb7tst.netapp.com
216.240.18.9	PTR	pv2pe.netapp.com
216.240.18.16	PTR	support.netapp.com
216.240.18.32	A	upload-legacy.netapp.com
216.240.18.37	A	w3w35034.att-webhosting.com
216.240.18.37	A	mx02.netapp.com
216.240.18.37	A	mail.c21gallowayherron.com
216.240.18.38	PTR	mx1.netapp.com
216.240.18.39	PTR	mx1s.netapp.com
216.240.18.44	A+PTR	ns.netapp.com
216.240.18.54	A+PTR	dc1-gslb.netapp.com
216.240.18.76	A+PTR	mx11.netapp.com
216.240.18.77	A+PTR	mx12.netapp.com
216.240.18.82	A+PTR	remotesupportagent-save.netapp.com
216.240.18.94	A	now-stage.netapp.com
216.240.18.100	A+PTR	ftp-legacy.netapp.com
216.240.18.101	A+PTR	ftp-legacy.netapp.com
216.240.19.4	A	ns12.netapp.com
216.240.19.22	A+PTR	homebase.netapp.com
216.240.19.22	PTR	webmail-apac.netapp.com
216.240.19.22	A+PTR	webmail-emea.netapp.com
216.240.19.24	A+PTR	us-snn-va02.netapp.com
216.240.19.24	A	homebase-b.netapp.com
216.240.19.52	A	homebase-test.netapp.com