Robtex

Up: 194.164.16.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 194.164.24.0/22
Down right: 194.164.28.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
194.164.25.66	A	mail.themainnameshop.com
194.164.25.66	A	mail.netzoomi.biz
194.164.25.66	A	mail.domainnameshop.us
194.164.28.130	PTR	mail.sja.org.uk
194.164.28.186	PTR	lists.sja.org.uk
194.164.28.190	PTR	mailgateway.sja.org.uk