Robtex

Up: 87.121.44.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 87.121.45.0/25
Down right: 87.121.45.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
87.121.45.33	A	plamer.net
87.121.45.78	PTR	dhcp-78.net1.bg
87.121.45.78	A	mail.ndt-ps.com
87.121.45.78	A	ndt-ps.com
87.121.45.218	PTR	develotica.com
87.121.45.218	A	mail2.outlookprivacy.com
87.121.45.218	A	outlookprivacy.com