Robtex

Up: 81.91.170.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 81.91.170.0/25
Down right: 81.91.170.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.91.170.1	PTR	ns1.denic.de
81.91.170.1	A	polacy.de
81.91.170.2	A+PTR	rri.denic.de
81.91.170.3	A+PTR	rri.test.denic.de
81.91.170.4	A	enum.rri.denic.de
81.91.170.5	A+PTR	rri.enum.test.denic.de
81.91.170.5	A	enum.rri.test.denic.de
81.91.170.6	A+PTR	whois.denic.de
81.91.170.6	A	de.whois-servers.net
81.91.170.8	A+PTR	mx1.mri.denic.de
81.91.170.9	A+PTR	mx2.mri.denic.de
81.91.170.10	PTR	gw-dns1.denic.de
81.91.170.11	A+PTR	ftp.denic.de
81.91.170.12	PTR	www.denic.de
81.91.170.12	A	mail.drugtrader.de
81.91.170.12	A	mail.tgeber.de
81.91.170.14	A	board.denic.de
81.91.170.15	A+PTR	board.secure.denic.de
81.91.170.16	A	member.denic.de
81.91.170.17	A+PTR	member.secure.denic.de
81.91.170.18	PTR	ds-plus.denic.de
81.91.170.18	A	ivb-herrenberg.de
81.91.170.18	A	www.mpc-consulting.de
81.91.170.19	A+PTR	mirror.denic.de
81.91.170.20	A+PTR	transit.denic.de
81.91.170.21	A+PTR	transit.secure.denic.de
81.91.170.22	PTR	nosupport.denic.de
81.91.170.22	A	www.busvoll.de
81.91.170.22	A	www.scoolix.de
81.91.170.23	A+PTR	whois.enum.denic.de
81.91.170.24	PTR	whois.enum.member.denic.de
81.91.170.25	A+PTR	mx1.mri.test.denic.de
81.91.170.26	A+PTR	dns.test.denic.de
81.91.170.27	PTR	whois.test.denic.de
81.91.170.28	A	whois.member.test.denic.de
81.91.170.32	A	intern.denic.de
81.91.170.33	A	intern.secure.denic.de
81.91.170.35	A	www.secure.test.denic.de
81.91.170.36	PTR	enum1.denic.de
81.91.170.38	A+PTR	ntp1.denic.de
81.91.170.38	A	member.test.denic.de
81.91.170.44	A+PTR	direct.denic.de
81.91.170.45	PTR	direct.secure.denic.de
81.91.170.47	A	infoseite.denic.de
81.91.170.48	A+PTR	dns.enum.test.denic.de
81.91.170.50	PTR	jira.secure.denic.de
81.91.170.51	PTR	whois.beta.denic.de
81.91.170.53	PTR	rri.beta.denic.de
81.91.170.63	A	rdap.denic.de
81.91.170.64	A	mailinglists.denic.de
81.91.170.64	A	lists.denic.de
81.91.170.71	A	secure-remote-1.denic.de