Robtex

Up: 31.177.64.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 31.177.64.0/25
Down right: 31.177.64.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
31.177.64.0	PTR	nic-network
31.177.64.1	PTR	msk-khouse-nr-hsrp.nic.ru
31.177.64.16	PTR	nic-network
31.177.64.24	PTR	nic-network
31.177.64.25	PTR	msk-khouse-nr-hsrp.nic.ru
31.177.64.28	A+PTR	netflow.nic.ru
31.177.64.32	PTR	nic-network
31.177.64.33	PTR	msk-khouse-nr-hsrp.nic.ru
31.177.64.66	PTR	msk-ctv-gw2.nic.ru
31.177.64.67	PTR	msk-ctv-gw1.nic.ru
31.177.64.72	PTR	nic-network
31.177.64.73	PTR	msk-khouse-hr-hsrp.nic.ru
31.177.64.74	PTR	msk-ctv-gw2.nic.ru
31.177.64.75	PTR	msk-ctv-gw1.nic.ru
31.177.64.76	PTR	rns2.cd.nic.ru
31.177.64.82	PTR	msk-khouse-hr2.nic.ru
31.177.64.83	PTR	msk-khouse-hr1.nic.ru
31.177.64.84	A+PTR	trusted.nic.ru
31.177.64.85	PTR	tp.nic1.ru
31.177.64.90	PTR	msk-ctv-gw1.nic.ru
31.177.64.91	PTR	msk-ctv-gw2.nic.ru
31.177.64.92	PTR	pumba.nic.ru
31.177.64.98	PTR	msk-khouse-hr2.nic.ru
31.177.64.99	PTR	msk-khouse-hr1.nic.ru
31.177.64.100	A+PTR	r01.nic.ru
31.177.64.100	A	www.russiandomain.ru
31.177.64.100	A	xn--e1aqdaiideye.xn--p1ai
31.177.64.111	PTR	nic-network
31.177.64.128	PTR	nic-network
31.177.64.130	PTR	msk-khouse-hr2.nic.ru
31.177.64.131	PTR	msk-khouse-hr1.nic.ru
31.177.64.132	A+PTR	po.nic.ru
31.177.64.143	PTR	nic-network
31.177.64.151	PTR	rc-ctv-public-mail-relay1.nic-network
31.177.64.153	PTR	msk-ctv-gw-hsrp.nic.ru
31.177.64.155	PTR	msk-khouse-nr1.nic.ru
31.177.64.156	A	puppet1.nic.ru
31.177.64.170	PTR	spb-ns1.nic.ru
31.177.64.171	PTR	nic-network
31.177.64.177	PTR	spb-nr1.nic.ru
31.177.64.193	PTR	msk-khouse-nr2.nic.ru
31.177.64.204	A	funniestword.com
31.177.64.204	A	susapp.com
31.177.64.204	A	finskaya1.ru
31.177.64.238	A+PTR	dedicated.fm.nic.ru
31.177.64.239	A+PTR	dns-hosting.fm.nic.ru
31.177.64.240	A+PTR	dnsproxy1.fm.nic.ru