Robtex

Up: 185.163.80.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 185.163.80.0/23
Down right: 185.163.82.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
185.163.80.8	PTR	mta05.zrh1.as64463.net
185.163.80.8	A	smtp.energyxs.com
185.163.80.8	A	smtp.interxs.ch
185.163.80.9	PTR	dns04.zrh1.as64463.net
185.163.80.10	PTR	dns05.zrh1.as64463.net
185.163.80.129	A+PTR	interxs.ch