Robtex

Up: 217.20.40.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 217.20.40.0/23
Down right: 217.20.42.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
217.20.40.71	A	supportequalpay.co.uk
217.20.40.73	A	find-a-property.com
217.20.40.75	A	marinehoseclaims.com
217.20.40.78	A	frasolutions.co.uk
217.20.40.80	A	mx01.forensicrisk.com
217.20.40.89	A+PTR	webmail.forensicrisk.com
217.20.40.100	A	dolphinfitness.com
217.20.40.100	A	dolphinfitness.me
217.20.40.114	A	dolphinfitness.co.uk
217.20.40.118	A	ariyan.net
217.20.40.119	A	www.dolphinfitness.co.uk
217.20.40.176	A	securemobile.sjp.co.uk
217.20.40.206	A	ns1.eu-ibi.co.uk
217.20.41.14	A	casino.wsop.com
217.20.41.15	A	wsopupdates.com
217.20.42.12	PTR	alldaypa.com
217.20.42.13	PTR	mail.alldaypa.com
217.20.42.13	A	mail.callcare247.com
217.20.42.13	A	mx00.callcare247.com
217.20.42.72	A	coopbedshop.co.uk
217.20.42.72	A	www.coopbedshop.co.uk
217.20.42.78	A	cebsappliances.co.uk
217.20.42.94	A	www.big-fund.net
217.20.42.113	A	webapps.whitfordww.com
217.20.42.132	A+PTR	ns1.pack-net.co.uk
217.20.42.132	A	ns1.unx.org.uk
217.20.42.132	A	unx.org.uk
217.20.42.135	A	www.dsl4you.co.uk
217.20.42.152	A	gee.technology
217.20.42.170	A	webpraxis.co.uk
217.20.42.170	A	thebeautystudio.org
217.20.42.170	A	s3.co.uk
217.20.42.202	A	graylog-vm.pack-net.co.uk
217.20.42.224	PTR	mail.pack-net.co.uk
217.20.42.224	A	mail.dsl4you.co.uk
217.20.42.224	A	mail.lhcltd.com
217.20.43.5	A	myoptima.co.uk
217.20.43.6	A+PTR	mail.dhp.uk.com
217.20.43.6	A	mail.optima7.net
217.20.43.6	A	optimabureau.com
217.20.43.8	A	cellhire.jp
217.20.43.9	A	www.dhp.uk.com
217.20.43.9	A	*.dhp.uk.com
217.20.43.9	A	www.optimaenergy.net
217.20.43.29	A	mx4.orbisaccess.co.uk
217.20.43.38	A+PTR	mx3.telecity.net
217.20.43.50	PTR	support.telecity.net
217.20.43.50	A	remedy.telecity.net
217.20.43.50	A	mail.telecityhelpdesk.com
217.20.43.51	A+PTR	man-dns01.telecity.net
217.20.43.51	A	ns2.telecityeurope.com
217.20.43.76	PTR	smtp.bacp.co.uk
217.20.43.131	PTR	ge-106-0-19.dis02.ma4.eu.equinix.net
217.20.43.140	PTR	www.edirectory.co.uk
217.20.43.140	A	moto-build-shop.co.uk
217.20.43.144	A	emerchants.co.uk
217.20.43.163	PTR	ge-104-0-1.dis02.ma3.eu.equinix.net
217.20.43.210	A+PTR	tau.ukgrid.net
217.20.43.235	PTR	traffic.telecity.net
217.20.43.235	A	trafficstats.telecity.net
217.20.43.251	PTR	ge-104-0-39.dis02.ma3.eu.equinix.net