Robtex

Up: 81.3.12.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 81.3.13.0/25
Down right: 81.3.13.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.3.13.4	A	mx1.csp-mail.de
81.3.13.4	A	regie24.org
81.3.13.4	A	regie24.de
81.3.13.5	A	docbee.com
81.3.13.6	A	www.csp-systems.de
81.3.13.7	A	eminemonejay.de
81.3.13.7	A	dirk-heine.de
81.3.13.10	A	pcg24.net
81.3.13.16	A+PTR	mx.csp-it.de
81.3.13.24	A	www.rws.de
81.3.13.27	A+PTR	isp.csp-it.de
81.3.13.27	A	tierklinik-isernhagen.info
81.3.13.27	A	www.firinit.de
81.3.13.29	A	lhg.me
81.3.13.34	A	eafileserver.de
81.3.13.35	A	easports.de
81.3.13.35	A	simcity.de
81.3.13.35	A	totalfifa.com
81.3.13.36	A	fiwc.de
81.3.13.36	A	virtuelle-bundesliga.de
81.3.13.54	A	www3.yyns.de
81.3.13.86	A	mail.myhh.de
81.3.13.86	A	babearchiv.de
81.3.13.86	A	cura-club.de
81.3.13.87	A	buschundpartner.de
81.3.13.87	A	kneipenfete.de
81.3.13.87	A	kneipen-feten.de
81.3.13.100	A	antik-hh.de
81.3.13.100	A	residenz-lotsenhaus.de
81.3.13.109	A	mail.managedvps.de
81.3.13.109	A	www.managedvps.de
81.3.13.109	A	managedvps.de
81.3.13.134	A	mein-tablet.net
81.3.13.134	A	meintablet.net
81.3.13.137	A	myhencke.de
81.3.13.148	A	wellenreitkurse.de
81.3.13.154	A+PTR	mx2.uvn-online.de
81.3.13.154	A	webmail.uvn-online.de
81.3.13.162	A	tfl200.hornve3110.siteprotect.eu
81.3.13.170	PTR	jesusfan.de
81.3.13.170	A	tabeaelkarra.de
81.3.13.170	A	sprengben.de
81.3.13.172	A	jesusmail.info
81.3.13.172	A	jesusmail.eu
81.3.13.178	A+PTR	ox6-1.cquadrat.com
81.3.13.178	A	mail.gundelbacher.com
81.3.13.178	A	mail.apg2.com
81.3.13.179	A	cquadrat.de
81.3.13.179	A	cquadrat.com
81.3.13.222	A	qx2.gfswebservices.de
81.3.13.228	A	ok-demo.de
81.3.13.229	A	montenet.de
81.3.13.230	A	map2fly.flynex.de
81.3.13.245	A	mail.xhammer.at
81.3.13.245	A	xhammer.at
81.3.13.247	PTR	s-esl2.echtwahr.com