Robtex

Up: 81.88.0.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 81.88.16.0/21
Down right: 81.88.24.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.88.16.1	PTR	r01-srv16.dus.de.tensteps.net
81.88.16.1	A	gw.core1.dus1.de.as31342.net
81.88.17.1	A+PTR	gw.core1.dus1.de.as31342.net
81.88.17.101	A	server1.yourwebstart.com
81.88.18.1	A+PTR	gw.core1.dus1.de.as31342.net
81.88.18.20	A	chartmailer.de
81.88.18.20	A	mail.boersen-magazin.com
81.88.18.20	A	fta-ltd.com
81.88.18.42	A	rosaleks.de
81.88.18.42	A	mail.rosaleks.de
81.88.18.51	A	mail10.baite05.de
81.88.18.51	A	baite05.de
81.88.18.61	A	gemballa-investors.com
81.88.18.61	A	www.gemballa-investors.com
81.88.18.194	PTR	web1.collin.pro
81.88.18.194	A	xn--wiike-ova.de
81.88.18.194	A	taxischeininfo.de
81.88.19.1	A+PTR	gw.core1.dus1.de.as31342.net
81.88.19.3	A+PTR	81.88.19.3.static.clanordns.net
81.88.19.3	A	mich-durstet.de
81.88.19.3	A	textlink.net
81.88.19.23	A	81.88.19.23.static.clanordns.net
81.88.19.45	A	mail.chickenchecker.com
81.88.20.1	PTR	81.88.20.1.static.clanordns.net
81.88.20.1	A	gw.core1.dus1.de.as31342.net
81.88.20.251	A	grafvonschwerin.de
81.88.20.251	A	*.grafvonschwerin.de
81.88.20.251	A	www.grafvonschwerin.de
81.88.21.1	A	gw.core1.dus1.de.as31342.net
81.88.21.25	A	asmodis-vap.mb-net.net
81.88.21.31	A	dns1.maxhost.de
81.88.21.32	A	web7.i-line.net
81.88.21.32	A	b-smtp02.essen.uplink.i-line.net
81.88.21.34	A	i-line.net
81.88.21.34	A	81.88.21.34.static.clanordns.net
81.88.22.1	A+PTR	gw.core1.dus1.de.as31342.net
81.88.22.1	A	mail1.oliverstorck.de
81.88.22.1	A	mail1.jazzzy.de
81.88.22.6	A	81.88.22.6.static.clanordns.net
81.88.22.66	A+PTR	server1.maschinist.org
81.88.22.66	A	mail.deutschtag.de
81.88.22.66	A	mail.mint-berlin.com
81.88.22.82	PTR	opub.de
81.88.22.82	A	mail.netz-funk.de
81.88.22.82	A	www.vaplab.de
81.88.22.83	PTR	opub.de
81.88.22.98	PTR	braun.tk
81.88.22.98	A	mail.mycomicworld.com
81.88.22.98	A	unitedlabels.at
81.88.23.1	A+PTR	gw.core1.dus1.de.as31342.net
81.88.23.2	A	ns2.opub.de
81.88.23.2	A	ns2.oliverstorck.de
81.88.23.6	A	mail.braun.tk
81.88.24.2	A+PTR	81.88.24.2.static.alvotech.net
81.88.24.2	A	ugog.de
81.88.24.2	A	lord-darc.de
81.88.24.3	PTR	81.88.24.3.static.alvotech.net
81.88.24.16	A+PTR	81.88.24.16.static.alvotech.net
81.88.24.16	A	mail.pdhq.de
81.88.24.16	A	pdhq.de
81.88.24.22	A	zarafa.ib-bludau.de
81.88.24.34	A+PTR	thomster.ch
81.88.24.34	A	mail.thomster.ch
81.88.24.40	A	ns2.outsource.de
81.88.24.40	A	ns2.server-zone.net
81.88.24.48	A	www.colorscards.com
81.88.24.48	A	colorscards.com
81.88.24.48	A	parafarmaciacastelldefels.com
81.88.24.49	PTR	deviantdevelopment.de
81.88.24.49	A	deviant-development.de
81.88.24.64	PTR	81.88.24.64.static.alvotech.net
81.88.24.66	A+PTR	81.88.24.66.static.alvotech.net
81.88.24.66	A	taico.me
81.88.24.67	A	pondersign.com
81.88.24.67	A	mail.pondersign.com
81.88.24.84	A	andznet.de
81.88.24.88	A	mail.mlsit.eu
81.88.24.88	A	mail.mlsmedia.de
81.88.24.88	A	mail.mlsmail.de
81.88.24.98	PTR	sv02.hauslinux.de
81.88.24.100	A	mail.easybytes.de
81.88.24.100	A	easybytes.de
81.88.24.102	A	berlin-vesak.de
81.88.24.104	A	mail.daraja.de
81.88.24.117	A	mail.goras.net
81.88.24.117	A	goras.net
81.88.24.117	A	spark.goras.net
81.88.24.129	A	k2hsolutions.fi
81.88.24.129	A	hakkanen.net
81.88.24.135	A	cravegig.com
81.88.24.139	A	mail.afzaal.de
81.88.24.144	A	mail.madheads.de
81.88.24.144	A	madheads.de
81.88.24.145	A+PTR	mx2.smart-mail.de
81.88.24.148	A	81.88.24.148.static.alvotech.net
81.88.24.160	A	mlsmail.de
81.88.24.160	A	webshop2go.de
81.88.24.163	PTR	81.88.24.163.static.alvotech.net
81.88.24.163	A	haselizolasyon.com
81.88.24.163	A	internetkitapcisi.com
81.88.24.180	A	tripp-it.de
81.88.24.180	A	freggedalic.de
81.88.24.180	A	mail.freggedalic.de
81.88.24.192	PTR	81.88.24.192.static.alvotech.net
81.88.24.192	A	de2.betamaster.us
81.88.24.194	A+PTR	charon.faked.org
81.88.24.199	A	ns1.bestgreek.info
81.88.24.199	A	ns2.bestgreek.info
81.88.24.211	PTR	server.weblow.de
81.88.24.211	A	go2handy.com
81.88.24.211	A	mail.go2handy.com
81.88.24.224	PTR	neu.jumbo.li
81.88.24.224	A	jumbo-mail.de
81.88.24.224	A	*.jumbo.li
81.88.24.245	A	diverseintensity.com
81.88.24.245	A	xperience-xcellence.com
81.88.25.2	PTR	81.88.25.2.static.alvotech.net
81.88.25.2	A	mail.kreativburg.mobi
81.88.25.2	A	traum-pfalz.de
81.88.25.51	A	bigger-friends.co.uk
81.88.25.51	A	biggerfriends.es
81.88.25.51	A	biggerfriends.fr
81.88.25.83	PTR	81.88.25.83.static.alvotech.net
81.88.28.11	A	fewomeereswoge.de
81.88.30.2	A	ns2.eu.avenir-international.com
81.88.31.12	A	mail.private4you.net
81.88.31.12	A	private4you.net
81.88.31.13	A	sofortabwixen.com
81.88.31.13	A	mail.sofortabwixen.com
81.88.31.16	A	mail.sofort-abwixen.net
81.88.31.16	A	sofort-abwixen.net
81.88.31.17	A	mail.gratis-wixen.com
81.88.31.17	A	gratis-wixen.com
81.88.31.98	A	gswsrvtec.com
81.88.31.98	A	mail.gswsrvtec.com
81.88.31.98	A	*.gswsrvtec.com
81.88.31.103	A	gswsrvtecc.com
81.88.31.113	A	gs-wsrv-tec.com
81.88.31.113	A	mail.gs-wsrv-tec.com
81.88.31.118	A	*.gsw-srv-tec.com
81.88.31.118	A	gsw-srv-tec.com
81.88.31.130	PTR	81.88.31.130.static.clanordns.net
81.88.31.130	A	mail.werbe-newsletter.com
81.88.31.130	A	werbe-newsletter.com
81.88.31.194	A	www.t-shirt-geschenkt.com
81.88.31.194	A	mail.t-shirt-geschenkt.com
81.88.31.194	A	t-shirt-geschenkt.com
81.88.31.196	A	mail.doubleprofiler.com