Robtex

Up: 216.210.192.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 216.210.192.0/22
Down right: 216.210.196.0/22

IP	Type	Hostname
216.210.193.34	A	mail.vistainternational.com
216.210.195.160	PTR	216-210-195-160.atgi.net
216.210.195.160	A	h-bar.com
216.210.195.189	A	immmailx64.immecor.com
216.210.196.13	A	border0-se2-1-19-1.sts.eschelon.com
216.210.196.29	A	mail.etraq.com
216.210.196.50	PTR	216-210-196-50.atgi.net
216.210.196.141	A	border0-se1-0-3-3.sts.eschelon.com
216.210.196.185	PTR	216-210-196-185.atgi.net
216.210.197.3	PTR	216-210-197-3.atgi.net
216.210.197.161	PTR	216-210-197-161.atgi.net
216.210.199.147	PTR	216-210-199-147.atgi.net
216.210.199.178	PTR	216-210-199-178.atgi.net
216.210.199.255	PTR	216-210-199-255.atgi.net