Robtex

Up: 151.189.0.0/16
Can't show all results, try to descend to a more specific CIDR
Down left: 151.189.0.0/18
Down right: 151.189.64.0/18
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
151.189.0.0	PTR	server-net-0.arcor-online.net
151.189.0.2	A	gate-vlan-0.arcor-online.net
151.189.0.3	A	gate1-vlan-0.arcor-online.net
151.189.0.4	A	gate0-1.arcor-online.net
151.189.0.5	A	gate0-2.arcor-online.net
151.189.0.171	A	voddb01.arcor-online.net
151.189.0.173	A	vod-db.arcor-online.net
151.189.0.181	A	vmwaretest1.arcor-online.net
151.189.0.182	A	vmwaretest2.arcor-online.net
151.189.1.2	A	gate-vlan-1.arcor-online.net
151.189.1.3	A	gate1-vlan-1.arcor-online.net
151.189.1.5	A	gate8-vlan-1.arcor-online.net
151.189.1.18	A	gate1.arcor-online.net
151.189.1.140	A	gate-arcor.arcor-online.net
151.189.4.33	A+PTR	wsb-h-cisco1.arcor-online.net
151.189.4.34	A	wsb-h-cisco2.arcor-online.net
151.189.4.35	A	wsb-h-virt.arcor-online.net
151.189.4.36	A	wsb-h-dalnet.arcor-online.net
151.189.8.0	PTR	server-net-8.arcor-online.net
151.189.8.1	A+PTR	gate8.arcor-online.net
151.189.8.2	A+PTR	gate8-catha1-1.arcor-online.net
151.189.8.3	A	gate8-catha1-2.arcor-online.net
151.189.8.4	A	pix525-z2-master.arcor-online.net
151.189.8.129	A	gate-d.arcor-online.net
151.189.8.130	PTR	syslog-sql01.arcor-online.net
151.189.8.130	A	gate-vlan-d.arcor-online.net
151.189.8.131	A	gate1-vlan-d.arcor-online.net
151.189.8.132	A	gate0-vlan-d.arcor-online.net
151.189.12.0	PTR	custom-net.arcor-online.net
151.189.12.1	A	gate-customer-new.arcor-online.net
151.189.12.14	A	gatec-customer.arcor-online.net
151.189.12.14	A	gatec.arcor-online.net
151.189.12.15	A+PTR	gatec-customer1.arcor-online.net
151.189.12.151	A	joker.arcor-online.net
151.189.12.165	A	checkit.arcor-online.net
151.189.12.188	PTR	pluto11.de
151.189.12.189	A	venturing.de
151.189.12.189	A	ourparty.de
151.189.13.25	A+PTR	ns2.arcor-online.net
151.189.13.25	A	ns2.germany.net
151.189.13.27	A	gate13.arcor-online.net
151.189.13.28	A	wsbcssw1-13.arcor-online.net
151.189.16.167	A	3net.at
151.189.16.174	A	mail.ccs-kommunikation.de
151.189.16.174	A	ccs-kommunikation.de
151.189.20.0	PTR	news-net.arcor-online.net
151.189.20.1	A	wsbcssw1-virt.arcor-online.net
151.189.20.2	A	wsbcssw1.arcor-online.net
151.189.20.3	A	wsbcssw2.arcor-online.net
151.189.20.11	A	news2.arcor-ip.de
151.189.20.130	A	instsrv-z1-vlan32.arcor-online.net
151.189.20.131	A	install1-vlan32.arcor-online.net
151.189.20.132	A	install2-vlan32.arcor-online.net
151.189.20.133	A	install3-vlan32.arcor-online.net
151.189.21.2	A+PTR	www-out2.arcor-online.net
151.189.21.3	A+PTR	www-out3.arcor-online.net
151.189.21.9	A+PTR	lb-out.arcor-online.net
151.189.21.21	A	install1-vlan33.arcor-online.net
151.189.21.133	A+PTR	resolv01.arcor-online.net
151.189.21.135	A+PTR	resolv02.arcor-online.net
151.189.21.137	A	resolv03.arcor-online.net
151.189.21.139	A	resolv04.arcor-online.net
151.189.23.9	A	proteus.wiesbaden.de.velia.net
151.189.23.9	A	ns3.velia.net
151.189.23.9	A	proteus.nuernberg.de.velia.net
151.189.23.10	PTR	schau-hin.arcor-online.net
151.189.23.11	A+PTR	ix-dns11.dnsbl.manitu.net
151.189.26.233	PTR	ns1.mars11.de
151.189.26.233	A	mail.webworld-design.de
151.189.26.233	A	autovista.de
151.189.32.129	A+PTR	d-gate.arcor-so.net
151.189.32.130	A+PTR	x-gate.arcor-so.net
151.189.32.148	A	wlan-ar.arcor-online.net
151.189.32.150	A+PTR	alien.arcor-so.net
151.189.33.19	A	ae-server.arcor-so.net
151.189.33.19	A	miki.arcor-so.net
151.189.33.23	A	avatar.arcor-so.net
151.189.34.22	A	venus.arcor-so.net
151.189.34.31	A	shrek.arcor-so.net
151.189.34.50	A	php.nexen2.de
151.189.34.50	A	grisu.arcor-so.net
151.189.34.155	A	huginn.arcor-so.net
151.189.34.155	A	home.nexen.de
151.189.34.161	A	nexen.de
151.189.34.161	A	alvin.arcor-so.net
151.189.40.1	A+PTR	wsb-vlan80.arcor-online.net
151.189.40.2	A	wsb-vlan80-1.arcor-online.net
151.189.40.3	A	wsb-vlan80-2.arcor-online.net
151.189.41.100	A	www.ng-online.de
151.189.41.105	A+PTR	mx.ng-online.de
151.189.42.25	A+PTR	rair-webadmin1.ng-online.de
151.189.43.1	A	d21161-1.netzdienste.de
151.189.43.3	PTR	ns.norplex-communications.com
151.189.43.3	A	ns.negge.de
151.189.43.3	A	ns.radekopf.net
151.189.43.5	A	embedded-systeme.de
151.189.52.134	PTR	pp.151.189.52.134.koe.germanynet.de
151.189.64.160	A	mail.6-search.net
151.189.64.160	A	mail.6-lust.net
151.189.77.1	A	gate-customer-net2.arcor-online.net