Robtex

Up: 217.139.224.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 217.139.224.0/25
Down right: 217.139.224.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
217.139.224.11	PTR	nscan.noorgroup.net
217.139.224.11	A	filter.noor.net
217.139.224.109	A	logs.noor.net
217.139.224.241	PTR	emblem.noorgroup.net
217.139.224.246	PTR	cyrix.noorgroup.net
217.139.224.246	PTR	packet.pos1-0.eg.noor.net
217.139.224.250	PTR	smtp.noor.net
217.139.224.250	A+PTR	smtp.noorgroup.net
217.139.224.250	A	imap.noorgroup.net
217.139.224.254	PTR	anaconda.noorgroup.net