Robtex

Up: 31.28.0.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 31.28.0.0/25
Down right: 31.28.0.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
31.28.0.39	A	mail.lotvent.ru
31.28.0.39	A	mx.lotvent.ru
31.28.0.45	A+PTR	mx.mediadis.ru
31.28.0.77	A	mail-server.ruscon.su
31.28.0.94	A	mail.ab-sretenka.ru
31.28.0.94	A	mail.design-boom.ru
31.28.0.124	A+PTR	ns1.tdebc.net
31.28.0.145	A+PTR	mail.mosproekt-4.ru
31.28.0.146	A	www.mosproekt-4.ru
31.28.0.153	PTR	inet.rbk-group.ru
31.28.0.153	A	pvhrus.ru
31.28.0.153	A	inet.pvhrus.ru
31.28.0.158	A+PTR	mail.belokam.ru
31.28.0.158	A	mail.belokamennaya.ru
31.28.0.206	A	mx.pir7.com
31.28.0.206	A	pir7.com
31.28.0.206	A	mail.pir7.com
31.28.0.229	A+PTR	newage.icr.su
31.28.0.229	A	el.icr.su