Robtex

Up: 193.31.128.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 193.31.128.0/20
Down right: 193.31.144.0/20

IP	Type	Hostname
193.31.128.10	A+PTR	mobile.wf-ib.de
193.31.128.20	A+PTR	mail.arge-a9.de
193.31.128.20	A	mail.wf-ib.de
193.31.128.25	A	portal.wf-ib.de
193.31.128.30	PTR	webmail.wf-ib.de
193.31.128.32	A	testportal.wf-ib.de
193.31.128.91	A	internet.wf-ib.de