Robtex

Up: 212.50.240.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 212.50.240.0/23
Down right: 212.50.242.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
212.50.240.0	PTR	212.50.240.0.16clouds.com
212.50.241.0	PTR	212.50.241.0.16clouds.com
212.50.242.243	A	ns1.byteisp.com
212.50.242.243	A	ns.byteisp.com
212.50.242.243	A	www.byteisp.com
212.50.243.195	A	www.kashanedu.ir