Robtex

Up: 31.133.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 31.133.48.0/23
Down right: 31.133.50.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
31.133.48.3	A+PTR	www.maildnr.ru
31.133.48.3	A	maildnr.ru
31.133.49.37	A+PTR	31-133-49-37.usetele.com
31.133.49.45	A+PTR	31-133-49-45.usetele.com
31.133.49.140	A	dnrdev.ru
31.133.49.140	A	www.dnrdev.ru
31.133.49.144	A	rcz-dnr.ru
31.133.49.189	A	rprec.ru
31.133.49.189	A	www.rprec.ru
31.133.49.189	A	ns.rprec.ru
31.133.50.40	A+PTR	mail.agrodon.su
31.133.50.40	A	www.agrodon.su
31.133.50.40	A	agrodon.su
31.133.50.50	A+PTR	31-133-50-50.usetele.com
31.133.50.50	A	www.sbu-inside.su
31.133.50.50	A	sbu-inside.su