Robtex

Up: 91.240.242.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 91.240.242.0/25
Down right: 91.240.242.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
91.240.242.50	PTR	net242-50.cloudstudio.ru
91.240.242.50	A	mail.tssnet.ru
91.240.242.52	PTR	net242-52.cloudstudio.ru
91.240.242.66	PTR	net242-66.cloudstudio.ru
91.240.242.73	PTR	static.73.242.240.91.ip.webhost1.net
91.240.242.73	A	top.top-dolls.net
91.240.242.73	A	ns12.top-dolls.net
91.240.242.98	PTR	net242-98.cloudstudio.ru
91.240.242.136	PTR	net242-136.cloudstudio.ru
91.240.242.136	A	mail.mvkb.ru
91.240.242.138	PTR	net242-138.cloudstudio.ru