Robtex

Up: 216.0.152.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 216.0.152.0/23
Down right: 216.0.154.0/23

IP	Type	Hostname
216.0.152.67	A+PTR	mail2.townofmorristown.org
216.0.152.69	PTR	mail2.townofmorristown.org
216.0.152.218	A	vantagevolatilityforecast.com
216.0.153.15	A+PTR	extmg03.externetworks.com
216.0.153.20	PTR	ext3cxnj01.externetworks.com
216.0.153.21	PTR	extmailb.externetworks.com
216.0.153.22	PTR	extmg01b.externetworks.com
216.0.153.23	PTR	extmg02b.externetworks.com
216.0.153.24	PTR	extnms01b.externetworks.com
216.0.153.25	A+PTR	extnas01.externetworks.com
216.0.153.37	A+PTR	extncentral01.externetworks.com
216.0.153.39	A+PTR	chat.externetworks.com
216.0.153.40	PTR	extdc02.externetworks.com