Robtex

Up: 91.204.96.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 91.204.100.0/23
Down right: 91.204.102.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
91.204.100.2	A	wifi.viptec.ru
91.204.100.3	A+PTR	ns.viptec.ru
91.204.100.3	A	ns1.viptec.ru
91.204.100.5	A+PTR	mail.viptec.ru
91.204.100.5	A	mail.wimax21.ru
91.204.100.5	A	admin.wimax21.ru
91.204.100.10	PTR	ns2.viptec.ru
91.204.100.10	A	admin.wimax21.ru
91.204.100.10	A	ns.wimax21.ru
91.204.100.11	PTR	zimbra.viptec.ru
91.204.100.11	A+PTR	mail.wimax21.ru
91.204.100.12	A	viptec.ru
91.204.100.23	A	svm.name
91.204.101.162	PTR	chb.gsf.ru
91.204.101.162	A	sib-mail.gsf.ru
91.204.101.246	A+PTR	mail.shgsm.ru
91.204.102.70	A+PTR	mail.bersgroup.ru
91.204.102.70	A	bersgroup.ru