Robtex

Up: 81.187.32.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 81.187.32.0/22
Down right: 81.187.36.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.187.32.0	A+PTR	0.32.187.81.in-addr.arpa
81.187.32.5	A	server.chrissutcliff.co.uk
81.187.32.5	PTR	81.187.32.5
81.187.32.8	PTR	81.187.32.8
81.187.32.8	A	mail.all-mod-cons.com
81.187.32.8	A	mail.outboards2go.com
81.187.32.34	A	pascal.hoggatt.eu
81.187.32.35	PTR	pascal.hoggatt.eu
81.187.32.36	PTR	36.32.187.81.in-addr.arpa
81.187.32.36	A	pascal.hoggatt.eu
81.187.32.36	A	wurth.hoggatt.eu
81.187.32.45	PTR	ravel.hoggatt.eu
81.187.32.46	PTR	debussy.hoggatt.eu
81.187.32.56	A	mail.choicemortgagesuk.com
81.187.32.62	A	62.32.187.81.in-addr.arpa
81.187.32.71	A	71.32.187.81.in-addr.arpa
81.187.32.77	PTR	81.187.32.77
81.187.32.83	A	83.32.187.81.in-addr.arpa
81.187.32.114	A	114.32.187.81.in-addr.arpa
81.187.32.141	PTR	81.187.32.141
81.187.32.163	PTR	81.187.32.163
81.187.32.170	PTR	81.187.32.170
81.187.32.175	A	175.32.187.81.in-addr.arpa
81.187.32.182	A	mikecoats.com
81.187.32.182	PTR	182.32.187.81.in-addr.arpa
81.187.32.182	A	local.mikecoats.com
81.187.32.216	A+PTR	216.32.187.81.in-addr.arpa
81.187.33.0	A+PTR	0.33.187.81.in-addr.arpa
81.187.33.6	A+PTR	6.33.187.81.in-addr.arpa
81.187.33.20	PTR	81.187.33.20
81.187.33.41	PTR	simonfar-macbookpro.visitors.farnz.org.uk
81.187.33.50	A	oberon.tremagi.org.uk
81.187.34.0	PTR	81.187.34.0
81.187.34.0	A	0.34.187.81.in-addr.arpa
81.187.34.28	A	exxoserver.com
81.187.34.100	PTR	81.187.34.100
81.187.35.0	A+PTR	0.35.187.81.in-addr.arpa
81.187.35.54	A+PTR	mail2.igo4.com
81.187.35.61	PTR	81.187.35.61
81.187.35.63	PTR	81.187.35.63
81.187.35.122	PTR	mail.humphriesweaving.co.uk
81.187.35.122	A+PTR	mail.stephenwalters.co.uk
81.187.35.122	PTR	mail.walterstrading.co.uk
81.187.35.130	A+PTR	bristol.powred.com
81.187.35.131	A+PTR	131.35.187.81.in-addr.arpa
81.187.35.131	A	mail.powred.com
81.187.35.146	A+PTR	chlapik.co.uk
81.187.35.149	A	retarrier.menavaur.org
81.187.35.155	PTR	81.187.35.155
81.187.35.157	A+PTR	rdog.co.uk
81.187.35.158	A	office.inetc.co.uk
81.187.35.169	A	rt1.amazing-internet.net
81.187.35.170	A	170.35.187.81.in-addr.arpa
81.187.35.188	PTR	81.187.35.188
81.187.35.202	A	www.bib.me.uk
81.187.35.204	A	mailgate.bgcomp.co.uk
81.187.35.204	A	ns1.mailtrap.org.uk
81.187.35.205	A	ns1.bgcomp.co.uk
81.187.35.242	A	ns1.menavaur.org
81.187.35.242	A	hanjague.menavaur.org
81.187.35.243	A	minmanueth.menavaur.org
81.187.35.243	A	www.menavaur.org
81.187.36.2	A	base-aaisp.mxtelecom.com
81.187.36.2	A	base-mx-aaisp.openmarket.com
81.187.36.4	A	chinook-aaisp.mxtelecom.com
81.187.36.4	A	chinook-aaisp.openmarket.com
81.187.36.89	PTR	81.187.36.89
81.187.36.90	PTR	lomaxesdc.lomaxes.me.uk
81.187.36.90	PTR	lomaxesex.lomaxes.me.uk
81.187.36.90	A	quakersineurope.org
81.187.36.108	PTR	81.187.36.108
81.187.36.108	A	exchange.elsravenhead.co.uk
81.187.36.108	A	exchange.eurolabsupplies.co.uk
81.187.36.150	A	sysinst.org
81.187.36.150	A	sysinst.info
81.187.36.202	A+PTR	plone.reflec.co.uk
81.187.36.202	A	reflec.com
81.187.36.202	A	reflec.co.uk
81.187.36.203	PTR	203.36.187.81.in-addr.arpa
81.187.37.0	A+PTR	0.37.187.81.in-addr.arpa
81.187.37.34	A	evanshomepage.com
81.187.37.34	A	hal.evanshomepage.com
81.187.37.34	A	mail.evanshomepage.com
81.187.37.48	A+PTR	48.37.187.81.in-addr.arpa
81.187.37.52	A	natch.scrumpy.me.uk
81.187.37.63	A	63.37.187.81.in-addr.arpa
81.187.37.67	A	garibaldi.zhadum.org.uk
81.187.37.98	A+PTR	mailgate2.netik.com
81.187.37.98	A	98.37.187.81.in-addr.arpa
81.187.37.130	A	creativemediacollege.org
81.187.37.130	A	desktop.shoalnet.org
81.187.37.130	A	digitalpreceptors.com
81.187.37.131	PTR	131.37.187.81.in-addr.arpa
81.187.37.140	A	currentlyunderconstruction.com
81.187.37.162	A	gorge.org
81.187.37.171	A+PTR	mail.chrysostomides.co.uk
81.187.37.171	A	chrysostomides.co.uk
81.187.37.200	A	200.37.187.81.in-addr.arpa
81.187.37.225	A	natch.scrumpy.me.uk
81.187.37.235	A	old-shed.scrumpy.me.uk
81.187.37.235	A	235.37.187.81.in-addr.arpa
81.187.38.0	A+PTR	0.38.187.81.in-addr.arpa
81.187.38.142	PTR	142.38.187.81.in-addr.arpa
81.187.38.152	A	152.38.187.81.in-addr.arpa
81.187.38.195	PTR	s1.elseif.co.uk
81.187.38.195	A	mail42.wrighton.net
81.187.38.195	A	elseif.co.uk
81.187.39.0	PTR	81.187.39.0
81.187.39.0	A	0.39.187.81.in-addr.arpa
81.187.39.34	PTR	81.187.39.34
81.187.39.34	A	34.39.187.81.in-addr.arpa
81.187.39.70	A	router.rabson.org