Robtex

Up: 213.81.0.0/16
Can't show all results, try to descend to a more specific CIDR
Down left: 213.81.0.0/18
Down right: 213.81.64.0/18
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
213.81.4.2	A+PTR	perr-lam-3-tenge91-1270481.network.virginmedia.net
213.81.29.254	A+PTR	254.29-81-213.static.virginmediabusiness.co.uk
213.81.29.254	A	mx1.debdalecare.co.uk
213.81.37.25	A+PTR	seac-lam-1-tenge72-414.network.virginmedia.net
213.81.37.153	A+PTR	renf-lam-4-tenge92-1306401.network.virginmedia.net
213.81.45.24	A+PTR	hari-psnpe-1-tenge84-126.network.virginmedia.net
213.81.64.186	PTR	cpc12-broo7-2-0-cust185.14-2.cable.virginm.net
213.81.64.186	A	mail.firow.co.uk
213.81.65.163	PTR	cpc10-broo7-2-0-cust162.14-2.cable.virginm.net
213.81.65.203	A	itrace.conflictarm.com
213.81.67.1	A	cpc7-midd15-2-0-gw.11-1.cable.virginm.net
213.81.68.18	A	schools-it.co.uk
213.81.68.18	A	west-street.org
213.81.68.18	A	mail.schools-it.co.uk
213.81.68.22	A	cpc7-leic15-2-0-cust21.8-1.cable.virginm.net
213.81.68.130	PTR	cpc7-leic15-2-0-cust129.8-1.cable.virginmedia.com
213.81.68.131	A+PTR	131.68-81-213.static.virginmediabusiness.co.uk
213.81.69.18	A	smtp.prioryacademies.co.uk
213.81.69.25	A	vvs.org.uk
213.81.69.26	A	26.69-81-213.static.virginmediabusiness.co.uk
213.81.69.27	A	27.69-81-213.static.virginmediabusiness.co.uk
213.81.69.243	A	grattonproperties.com
213.81.69.243	A	growyourbrands.com
213.81.69.243	A	polariscomputers.org
213.81.70.52	A	mailhost.dnet.co.uk
213.81.70.52	A	52.70-81-213.static.virginmediabusiness.co.uk
213.81.70.52	A	mail.dnet.co.uk
213.81.70.66	A	gateway.priorysouthsea.org
213.81.70.165	A	remote.eastridingsacks.co.uk
213.81.71.36	A	cpc7-leic15-2-0-cust803.8-1.cable.virginmedia.com
213.81.71.46	A	mail.chichesterhighschoolforgirls.co.uk
213.81.71.106	A	ns1.scarletfm.com
213.81.71.106	A	ns2.scarletfm.com
213.81.71.233	A	zuumait.com
213.81.71.244	A	alshirkat.org
213.81.73.10	PTR	10.73-81-213.static.virginmediabusiness.co.uk
213.81.73.10	A	redcar-cleveland.gov.uk
213.81.74.180	PTR	180.74-81-213.static.virginmediabusiness.co.uk
213.81.74.180	A	transferqaa.qa.com
213.81.74.206	PTR	206.74-81-213.static.virginmediabusiness.co.uk
213.81.74.206	A	myqa.qa.com
213.81.81.170	A	cpc2-papw5-2-0-cust425.5-3.cable.virginm.net
213.81.82.48	A	cpc2-papw5-2-0-cust559.5-3.cable.virginm.net
213.81.83.196	A	study-1.hopto.org
213.81.84.47	A+PTR	cpc1-papw5-2-0-cust46.5-3.cable.virginm.net
213.81.84.49	A+PTR	cpc1-papw5-2-0-cust48.5-3.cable.virginm.net
213.81.84.94	A+PTR	cpc1-papw5-2-0-cust93.5-3.cable.virginm.net
213.81.84.94	A	vinoteca.thruhere.net
213.81.84.140	A+PTR	cpc1-papw5-2-0-cust139.5-3.cable.virginm.net
213.81.84.241	A	www.rangeace.com
213.81.91.158	A+PTR	158.91-81-213.static.virginmediabusiness.co.uk
213.81.92.1	PTR	cpc13-finc14-2-0-gw.4-2.cable.virginm.net
213.81.93.28	A+PTR	cpc13-finc14-2-0-cust283.4-2.cable.virginm.net
213.81.93.225	A+PTR	cpc13-finc14-2-0-cust480.4-2.cable.virginm.net
213.81.94.12	A+PTR	cpc13-finc14-2-0-cust523.4-2.cable.virginm.net
213.81.94.141	A+PTR	cpc13-finc14-2-0-cust652.4-2.cable.virginm.net
213.81.95.121	A	karur.co.uk
213.81.104.174	A	cpc13-burn8-2-0-cust173.10-1.cable.virginm.net
213.81.105.210	A+PTR	210.105-81-213.static.virginmediabusiness.co.uk
213.81.105.237	A+PTR	237.105-81-213.static.virginmediabusiness.co.uk
213.81.106.2	A+PTR	cpc18-stkp7-2-0-cust1.10-2.cable.virginm.net
213.81.106.24	A	cpc18-stkp7-2-0-cust23.10-2.cable.virginm.net
213.81.106.25	A	cpc18-stkp7-2-0-cust24.10-2.cable.virginm.net
213.81.106.41	A	cpc18-stkp7-2-0-cust40.10-2.cable.virginm.net
213.81.106.150	A	cpc18-stkp7-2-0-cust149.10-2.cable.virginm.net
213.81.106.152	A	cpc18-stkp7-2-0-cust151.10-2.cable.virginm.net
213.81.106.162	A	cpc18-stkp7-2-0-cust161.10-2.cable.virginm.net
213.81.106.163	A	cpc18-stkp7-2-0-cust162.10-2.cable.virginm.net
213.81.107.11	A	jambuttycamp.org.uk
213.81.107.11	A	morgandavison.co.uk
213.81.108.31	A	31.108-81-213.static.virginmediabusiness.co.uk
213.81.108.40	A	40.108-81-213.static.virginmediabusiness.co.uk
213.81.108.44	A	44.108-81-213.static.virginmediabusiness.co.uk
213.81.108.46	A	46.108-81-213.static.virginmediabusiness.co.uk
213.81.108.128	A+PTR	128.108-81-213.static.virginmediabusiness.co.uk
213.81.108.129	A+PTR	129.108-81-213.static.virginmediabusiness.co.uk
213.81.108.130	A+PTR	130.108-81-213.static.virginmediabusiness.co.uk
213.81.108.132	A	132.108-81-213.static.virginmediabusiness.co.uk
213.81.112.244	A	244.112-81-213.static.virginmediabusiness.co.uk
213.81.116.57	A+PTR	brad-lam-3-tenge92-1477500.network.virginmedia.net
213.81.117.75	A	know-lam-3-tenge92-1200402.network.virginmedia.net
213.81.121.93	A+PTR	93.121-81-213.static.virginmediabusiness.co.uk
213.81.122.73	A+PTR	73.122-81-213.static.virginmediabusiness.co.uk
213.81.123.32	A	32.123-81-213.static.virginmediabusiness.co.uk
213.81.124.12	A	12.124-81-213.static.virginmediabusiness.co.uk
213.81.125.17	A+PTR	pres-lam-2-tenge91-2049401.network.virginmedia.net
213.81.127.6	A	6.127-81-213.static.virginmediabusiness.co.uk
213.81.127.10	A	10.127-81-213.static.virginmediabusiness.co.uk
213.81.127.11	A	11.127-81-213.static.virginmediabusiness.co.uk
213.81.127.16	A	16.127-81-213.static.virginmediabusiness.co.uk
213.81.127.133	A	133.127-81-213.static.virginmediabusiness.co.uk
213.81.127.134	A	134.127-81-213.static.virginmediabusiness.co.uk
213.81.127.136	A	136.127-81-213.static.virginmediabusiness.co.uk
213.81.127.157	A	perr-geam-1b-tenge41-3120.network.virginmedia.net