Robtex

Up: 81.89.62.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 81.89.63.0/25
Down right: 81.89.63.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.89.63.10	PTR	mx2.netech.sk
81.89.63.10	A	mail2.meracrest.sk
81.89.63.10	A	mx.the.sk
81.89.63.12	A	tvta3.sk
81.89.63.12	A	ta3tv.sk
81.89.63.15	PTR	ns1.netech.sk
81.89.63.16	PTR	ib.trustpay.eu
81.89.63.19	PTR	81.89.63.19.vnet.sk
81.89.63.19	A	test.trustpay.eu
81.89.63.20	PTR	81.89.63.20.host.vnet.sk
81.89.63.20	A	ns.meracrest.sk
81.89.63.20	A	ns1.the.sk
81.89.63.32	PTR	81.89.63.32.host.vnet.sk
81.89.63.38	PTR	81.89.63.38.vnet.sk
81.89.63.40	A	maxbetadmin.com
81.89.63.43	PTR	81.89.63.43.vnet.sk
81.89.63.50	A	web2.the.sk
81.89.63.50	A	web.the.sk
81.89.63.63	PTR	81.89.63.63.vnet.sk
81.89.63.66	A+PTR	lb01.vnet.sk
81.89.63.66	A	dns.vnet.sk
81.89.63.66	A	dns1.vnet.sk
81.89.63.67	A+PTR	lb02.vnet.sk
81.89.63.67	A	dns.vnet.cz
81.89.63.68	A+PTR	mail01.vnet.sk
81.89.63.68	A	mx.vnet.eu
81.89.63.68	A	mx.vnet.sk
81.89.63.69	PTR	mail02.vnet.sk
81.89.63.69	A	mx.vnet.sk
81.89.63.69	A	mx2.vnet.eu
81.89.63.70	PTR	webadmin.vnet.sk
81.89.63.70	A	borymall.eu
81.89.63.70	A	cspolomka.sk
81.89.63.71	PTR	mail.vnet.sk
81.89.63.71	A	smtp.e-net.sk
81.89.63.71	A	mail.belnet.sk
81.89.63.129	A+PTR	gw-hq.vnet.sk
81.89.63.132	A+PTR	blackmoon.vnet.sk
81.89.63.134	A+PTR	nico.vnet.sk
81.89.63.136	A+PTR	gajo.vnet.sk
81.89.63.150	PTR	portalis.vnet.sk
81.89.63.150	A	mailinbackup1.portalis.sk