Robtex

Up: 217.31.0.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 217.31.16.0/21
Down right: 217.31.24.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
217.31.16.1	PTR	atm-4-backbone.wel.de
217.31.16.1	A	smtp2.werner-sonnenschutz.de
217.31.16.1	A	smtp2.intim.tv
217.31.16.17	A+PTR	smtp.huellwegen.de
217.31.16.17	A	mediagrafx.de
217.31.16.17	A	smilla.mediagrafx.de
217.31.16.18	PTR	www.huellwegen.de
217.31.16.18	A	used-light.com
217.31.16.39	A	admin.wel.de
217.31.16.40	PTR	smtp2.bausanierung-eickmeier.de
217.31.16.40	PTR	mx.mediagrafx.de
217.31.16.40	PTR	mailspooler.wel.de
217.31.16.57	A	hardcorevideo.tv
217.31.16.57	A	www.pornobox.tv
217.31.16.150	A+PTR	ns1.wel-net.de
217.31.16.150	A	ns01.wel.de
217.31.16.152	A+PTR	plesk.wel.de
217.31.16.159	A	my-freecar.de
217.31.16.164	A	digital-lighting.info
217.31.16.209	A	roepke-mobile.de
217.31.16.210	A	*.release.de
217.31.16.210	A	release.de
217.31.16.218	PTR	atm-gate-city.net.wel.de
217.31.16.219	PTR	atm-gate-city.net.wel.de
217.31.17.194	PTR	ftp.anyfiler.de
217.31.17.194	A+PTR	imap.anyfiler.de
217.31.17.194	PTR	mail.anyfiler.de