Robtex

Up: 88.81.64.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 88.81.64.0/20
Down right: 88.81.80.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
88.81.64.1	PTR	ovgw.fifejdy.cz
88.81.64.1	A	r1.fifejdy.cz
88.81.64.39	A	noc.fifejdy.cz
88.81.64.39	A	home.betaz.cz
88.81.64.39	A	fifejdy.cz
88.81.64.40	PTR	mail.fifejdy.cz
88.81.64.74	A	cihelni.betaz.cz
88.81.65.47	PTR	lr-danceteam.cz
88.81.65.181	A	latky-metraz.cz
88.81.66.156	PTR	mail.zebra.cz
88.81.66.156	A	mail.parallels.cz
88.81.66.179	A+PTR	kerio.surik.cz
88.81.67.74	A	remote.bruzovice.cz
88.81.67.74	A	mail.bruzovice.cz
88.81.67.221	A	sidek.cz
88.81.70.29	A	ok2rf.cz
88.81.71.102	PTR	mail.vjacka.cz
88.81.71.163	A	mx.bestquality.cz
88.81.71.218	A	motozermanice.com
88.81.72.85	A	*.zjevik.com
88.81.72.85	A	zjevik.com
88.81.72.91	A+PTR	mail.zjevik.com
88.81.74.48	PTR	pc2.sinesco.com
88.81.75.78	PTR	mail.lexel.cz
88.81.75.131	A+PTR	osiris.mscmetpro.cz
88.81.76.54	PTR	pc4.semodata.cz
88.81.76.55	PTR	pc5.semodata.cz
88.81.77.77	A+PTR	mail.alfaplastik.cz
88.81.78.98	A	jiglid.com
88.81.80.37	A+PTR	pc5.semodata.cz
88.81.80.82	PTR	home.betaz.cz
88.81.81.150	A+PTR	mail.asgc.info
88.81.81.150	A	*.asgc.info
88.81.81.150	A	asgc.info
88.81.82.25	A+PTR	smtp.skolazh.cz
88.81.82.25	A	mail.skolazh.cz
88.81.82.227	A+PTR	smtp.csv.cz
88.81.82.227	A	mail.csv.cz
88.81.82.227	A	sherif.csv.cz
88.81.84.133	A+PTR	mail.grange.cz
88.81.85.73	PTR	remote.ochi.cz
88.81.85.83	A	mail2.ostravak.com
88.81.85.83	A	danceforever.cz
88.81.85.83	A	tktrend.cz
88.81.85.88	A	tktrend.cz
88.81.85.90	A	mail2.ostravak.com
88.81.86.60	A+PTR	mail.kabedex.cz
88.81.86.69	A	pbnt.cz
88.81.86.82	A	mobilservis.eu
88.81.87.251	PTR	mail.fifejdy.cz
88.81.88.149	PTR	remote.lifeline.cz
88.81.89.10	A	mail.bramaz.cz
88.81.89.10	A	ns.bramaz.cz
88.81.89.10	A	bramaz.cz
88.81.89.21	A+PTR	01vydex.vydona.cz
88.81.89.46	A	lacky.nwt.cz
88.81.89.53	A	tools.pilana.cz
88.81.89.202	PTR	mail.papirshop.cz
88.81.89.202	A	mail2.papirshop.cz
88.81.90.1	PTR	host1.nwt.cz
88.81.90.4	PTR	host4.nwt.cz
88.81.90.18	A	mail.auttep.cz
88.81.90.35	PTR	host35.nwt.cz
88.81.90.66	PTR	host66.nwt.cz
88.81.90.66	A	www.sosbph.cz
88.81.90.66	A	sosbph.cz
88.81.90.67	PTR	host67.nwt.cz
88.81.90.67	A	neota.cz
88.81.90.67	A	neore.cz
88.81.90.98	A	www.gymhol.cz
88.81.90.99	PTR	host99.nwt.cz
88.81.90.99	A	kurzovni.eu
88.81.90.99	A	sporthotelkurzovni.eu
88.81.90.138	A	fako.fako.cz
88.81.90.142	A	mail.gymhol.cz
88.81.90.163	PTR	host163.nwt.cz
88.81.90.163	A	email.tydenik-km.cz
88.81.90.192	PTR	host192.nwt.cz
88.81.90.193	PTR	host193.nwt.cz
88.81.90.225	PTR	host225.nwt.cz
88.81.91.123	A	01vydex.vydona.cz
88.81.91.130	PTR	rt.fatra.cz
88.81.91.161	A+PTR	home.oswnet.net
88.81.91.161	A	zero.oswnet.net
88.81.91.161	A	*.oswnet.net
88.81.91.163	A	2.dnsservers.name
88.81.91.228	A	balej-elektro.cz
88.81.91.228	A	internet-sirius.cz
88.81.92.1	A+PTR	fmgw.fifejdy.cz
88.81.92.122	A+PTR	mail.ostravice-sport.cz
88.81.92.122	A	ostravice-sport.cz
88.81.92.248	A	damian.synology.me
88.81.95.82	PTR	home.betaz.cz
88.81.95.82	A	ns2.betaz.cz