Robtex

Up: 216.12.144.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 216.12.144.0/23
Down right: 216.12.146.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.12.144.5	PTR	mmm-prod-sev1.norton.com
216.12.144.10	A	csasalt.symantec.com
216.12.144.16	A	lc1alt.symantec.com
216.12.144.33	PTR	xsas.symantec.com
216.12.144.34	A	msq-sev-prod.norton.com
216.12.144.44	PTR	webdl.symantec.com
216.12.144.48	A	mmm-prod-sev1.norton.com
216.12.144.50	A	sshomealt.symantec.com
216.12.144.51	A+PTR	sssgsalt.symantec.com
216.12.144.52	A+PTR	ssawalt.symantec.com
216.12.144.53	A	ssispssalt.symantec.com
216.12.144.54	A+PTR	sas1alt.symantec.com
216.12.144.55	A+PTR	xhome2alt.symantec.com
216.12.144.56	PTR	xcostalt.symantec.com
216.12.144.57	A+PTR	sasrootalt.symantec.com
216.12.144.58	A+PTR	sluplistalt.symantec.com
216.12.144.59	A+PTR	sosftpalt.symantec.com
216.12.144.60	A	pif.symantec.com
216.12.144.80	PTR	siaw.symantec.com
216.12.144.90	A+PTR	sigs.symantec.com
216.12.144.90	A	sigs.symantec.com.gtm.symantec.com
216.12.144.90	A	sigs1alt.symantec.com
216.12.145.1	PTR	v425.isg2k-01-3e5.ops.servervault.com
216.12.145.4	PTR	v425-ha.f5-01-3e6.ops.servervault.com
216.12.145.5	PTR	v425.f5-01-3e6.ops.servervault.com
216.12.145.6	PTR	v425.f5-02-3e6.ops.servervault.com
216.12.145.16	A+PTR	symantec-liveupdate-vip01.vip.cust.servervault.com
216.12.145.17	A	antivirus.norton.com
216.12.145.20	A	www.shop.symantec.com
216.12.145.20	A	*.openstoragelayer.net
216.12.145.20	A	securingaconnectedworld.com
216.12.146.10	PTR	isc14.isc2.org
216.12.146.40	PTR	isc11.isc2.org
216.12.146.111	A+PTR	isc17.cust.servervault.com
216.12.146.112	PTR	mail.isc2.org
216.12.146.113	PTR	isc12.isc2.org
216.12.146.114	PTR	mail.isc2.org
216.12.146.118	A+PTR	isc39.cust.servervault.com
216.12.146.120	PTR	exchange.isc2.org
216.12.146.140	PTR	isc10.isc2.org
216.12.146.144	PTR	cyberexchange.isc2.org
216.12.146.145	PTR	vpn.isc2.org
216.12.146.146	A+PTR	vlan465.ns50-01-3c16.ops.servervault.com
216.12.146.148	PTR	www.isc2.org
216.12.146.149	PTR	pin.isc2.org
216.12.146.201	PTR	isc21.cust.servervault.com
216.12.146.203	PTR	isc27.cust.servervault.com
216.12.146.231	PTR	ns208-01-3c16.ops.servervault.com
216.12.146.232	PTR	ns208-02-3c16.ops.servervault.com
216.12.147.8	A+PTR	ssg5-01-3d8.ops.servervault.com
216.12.147.11	A+PTR	ssg350-01-034.ops.servervault.com
216.12.147.12	A+PTR	ssg350-02-034.ops.servervault.com
216.12.147.14	PTR	ssg5-01-3b7.cust.servervault.com
216.12.147.69	A+PTR	vastec-dr01.cust.servervault.com
216.12.147.70	A+PTR	vastec-web01.cust.servervault.com
216.12.147.71	A	www.vastecondemand.com
216.12.147.71	A	vastecondemand.com
216.12.147.101	PTR	ssg140-01-3d13.cust.servervault.com
216.12.147.197	PTR	ssg550-01-3d19.cust.servervault.com
216.12.147.198	PTR	ssg550-02-3d19.ops.servervault.com