Robtex

Up: 72.20.8.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 72.20.12.0/23
Down right: 72.20.14.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.20.12.33	PTR	reseller.paiolhosting.net
72.20.12.33	A	ns11.ayns.net.20120907002451.deleted.gkg.net
72.20.12.33	A	ns1.maiochi.info
72.20.12.34	A	ns2.maiochi.info
72.20.12.34	A	ns2.skynetlanhouse.com
72.20.12.40	PTR
72.20.12.43	A	vps-customer-72-20-12-43.paiolhosting.com
72.20.12.45	A	vps-customer-72-20-12-45.paiolhosting.com
72.20.12.51	A	vps-customer-72-20-12-51.paiolhosting.com
72.20.12.57	A	vps-customer-72-20-12-57.paiolhosting.com
72.20.12.101	PTR
72.20.12.129	PTR
72.20.12.129	A	mail.articleunderground.com
72.20.12.129	A	mail.midimusicsoftware.com
72.20.12.130	PTR
72.20.12.133	A+PTR	mail.staminus.net
72.20.12.134	PTR
72.20.12.134	A	mx.ddosmap.com
72.20.12.134	A	mx.techblogs.us
72.20.12.145	PTR
72.20.12.145	A	90726.com
72.20.12.178	A	www.woool24.com
72.20.12.200	PTR
72.20.12.200	A	hourlystrategy.com
72.20.12.200	A	profitsquickfund.com
72.20.12.202	PTR
72.20.12.218	A	uiforum.uaeforum.org
72.20.13.2	PTR	observers.net
72.20.13.9	A	onegirl.violates.us
72.20.13.10	PTR	ubersource.net
72.20.13.13	A	irc.observers.net
72.20.13.26	A	ns1.observers.net
72.20.13.27	A	ns2.observers.net
72.20.13.28	A	ns3.observers.net
72.20.13.29	A	that.bitch.from.observers.net
72.20.13.29	A	show.titsorgtfo.org
72.20.13.29	A	ns4.observers.net
72.20.13.35	PTR
72.20.13.38	A	doclothingchina.com
72.20.13.52	PTR	nocturnal.bloodlu.st
72.20.13.58	PTR
72.20.13.60	PTR
72.20.13.61	PTR
72.20.13.65	PTR
72.20.13.69	PTR
72.20.13.76	PTR
72.20.13.77	PTR	fundprocess.com
72.20.13.81	PTR	cp0.flashbyte.us
72.20.13.82	PTR	cp1.flashbyte.us
72.20.13.83	PTR	cp2.flashbyte.us
72.20.13.83	A	ns3.flashbyte.us
72.20.13.84	PTR	cp3.flashbyte.us
72.20.13.86	PTR	cp5.flashbyte.us
72.20.13.88	PTR	cp7.flashbyte.us
72.20.13.140	A	rl0.net
72.20.13.228	A	you.retard.cc
72.20.13.235	A	maximum.devis.tation.net
72.20.13.248	A	j00.me
72.20.14.1	PTR	bensumshell.net
72.20.14.1	A	mail.cryhmehook.us
72.20.14.1	A	cryhmehook.us
72.20.14.2	A	eur7.com
72.20.14.7	A	cqcshc.com
72.20.14.8	A	hktbf.com
72.20.14.12	A	mail.clan-club.dk
72.20.14.15	PTR	bensumshell.net
72.20.14.15	A	ccieunnumbered.org
72.20.14.16	PTR	bensumshell.net
72.20.14.17	PTR	bensumshell.net
72.20.14.17	A	yesgm.com
72.20.14.19	A	1ggj.com
72.20.14.20	PTR	bensumshell.net
72.20.14.20	A	029py.com
72.20.14.23	PTR	bensumshell.net
72.20.14.23	A	freshstartautosales.info
72.20.14.23	A	133kf.com
72.20.14.26	A	www.k846.com
72.20.14.27	A	880980.com
72.20.14.31	PTR	bensumshell.net
72.20.14.31	A	wc555.com
72.20.14.35	A	dzldkt.com
72.20.14.38	PTR	bensumshell.net
72.20.14.38	A	mail.eaglevision.dk
72.20.14.40	A	lblbn.com
72.20.14.44	PTR	bensumshell.net
72.20.14.44	A	bjkmsc.com
72.20.14.49	A	maiari.com
72.20.14.53	PTR	bensumshell.net
72.20.14.53	A	pjtxjd.com
72.20.14.56	A	seo560.com
72.20.14.57	PTR	bensumshell.net
72.20.14.57	A	sjkzi.com
72.20.14.58	PTR	bensumshell.net
72.20.14.58	A	sq518.com
72.20.14.60	PTR	bensumshell.net
72.20.14.62	A	netfxinvest.com
72.20.14.62	A	netniceinvest.com
72.20.14.62	A	finforexgroup.com
72.20.14.64	PTR	bensumshell.net
72.20.14.64	A	eastern-europe.biz
72.20.14.64	A	bjyakl.com
72.20.14.69	PTR	bensumshell.net
72.20.14.71	PTR	bensumshell.net
72.20.14.73	PTR	bensumshell.net
72.20.14.79	PTR	bensumshell.net
72.20.14.79	A	topys.org
72.20.14.82	PTR	bensumshell.net
72.20.14.82	A	hz8866.com
72.20.14.84	PTR	bensumshell.net
72.20.14.84	A	qili688.com
72.20.14.85	A	shyici.com
72.20.14.90	PTR	bensumshell.net
72.20.14.91	PTR	bensumshell.net
72.20.14.94	A	jjm100.com
72.20.14.97	PTR	bensumshell.net
72.20.14.98	PTR	bensumshell.net
72.20.14.99	PTR	bensumshell.net
72.20.14.99	A	tjycbxg.com
72.20.14.100	PTR	bensumshell.net
72.20.14.100	A	wanda17.com
72.20.14.100	A	elskar.tolvur.net
72.20.14.101	A	ptyzzz.com
72.20.14.101	A	yqsct.com
72.20.14.102	PTR	bensumshell.net
72.20.14.105	A	linuxgods.speakz.org
72.20.14.106	PTR	bensumshell.net
72.20.14.106	A	rfc1459.speakz.org
72.20.14.107	PTR	bensumshell.net
72.20.14.107	A	jychh.com
72.20.14.109	A	intellectulaw.us
72.20.14.129	A	abuse.staminus.net
72.20.14.132	PTR
72.20.14.132	A	newartbet.com
72.20.14.132	A	facesbet7.com
72.20.14.133	PTR
72.20.14.137	PTR
72.20.14.138	PTR
72.20.14.139	PTR
72.20.14.140	PTR
72.20.14.157	PTR
72.20.14.170	PTR
72.20.14.170	A	te-dua.de
72.20.14.170	A	xn--uk-4ia.com
72.20.14.202	A	ra456.com
72.20.14.203	A	hg11222.com
72.20.14.204	PTR
72.20.14.204	A	hg11666.com
72.20.14.248	PTR
72.20.14.248	A	etc.durms.net
72.20.15.4	PTR
72.20.15.4	A	*.webccbill.com
72.20.15.4	A	webcardbill.com
72.20.15.6	PTR	72.20.15.6.staminus.net
72.20.15.19	PTR	pornographic.moviepost.net
72.20.15.21	PTR
72.20.15.33	PTR	server363.sekershell.com
72.20.15.34	PTR	server363.sekershell.com
72.20.15.35	PTR	server363.sekershell.com
72.20.15.36	PTR	server363.sekershell.com
72.20.15.37	PTR	server363.sekershell.com
72.20.15.38	PTR	server363.sekershell.com
72.20.15.41	A	wireless0day.ganjafarmer.net
72.20.15.41	A	11purse.com
72.20.15.50	PTR
72.20.15.50	A	pdns2.chrysalisnet.org
72.20.15.54	PTR
72.20.15.57	PTR
72.20.15.57	A	mizar.lod.com
72.20.15.59	PTR
72.20.15.61	PTR	72.20.15.61.staminus.net
72.20.15.61	A	ns5.sounds-familiar.com
72.20.15.61	A	bahh.in
72.20.15.62	PTR	72.20.15.62.staminus.net
72.20.15.62	A	developersmx.com
72.20.15.65	PTR
72.20.15.69	PTR
72.20.15.120	PTR
72.20.15.121	PTR
72.20.15.129	PTR	safemod.net
72.20.15.130	PTR	safemod.net
72.20.15.131	PTR	safemod.net
72.20.15.132	PTR	safemod.net
72.20.15.133	PTR	safemod.net
72.20.15.134	PTR	safemod.net
72.20.15.135	PTR	safemod.net
72.20.15.136	PTR	safemod.net
72.20.15.137	PTR	safemod.net
72.20.15.138	PTR	safemod.net
72.20.15.139	PTR	safemod.net
72.20.15.140	PTR	safemod.net
72.20.15.141	PTR	safemod.net
72.20.15.142	PTR	safemod.net
72.20.15.143	PTR	safemod.net
72.20.15.242	A	klassrv.com