Robtex

Up: 31.13.16.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 31.13.17.0/25
Down right: 31.13.17.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
31.13.17.20	A+PTR	mail.forward-hkg.com
31.13.17.43	PTR	mail.rekapstroy.ru
31.13.17.66	PTR	mail2.vlux.ru
31.13.17.66	A	www.vluxnet.ru
31.13.17.66	A	belden.kz
31.13.17.82	PTR	agroresource.com
31.13.17.82	A	mx.agroresource.com
31.13.17.83	PTR	cafecoton.ru
31.13.17.84	PTR	m.e24.ru
31.13.17.84	A	ddzp.ru
31.13.17.85	PTR	e24.ru
31.13.17.86	PTR	m.agroresource.com
31.13.17.90	A	energofichtner.ru
31.13.17.91	A	ef-in.ru
31.13.17.91	A	www.ef-in.ru
31.13.17.91	A	mail.ef-in.ru
31.13.17.120	A	msk.speechpro.com
31.13.17.134	A	kp-dealer.ru
31.13.17.134	A	kpdealer.ru
31.13.17.162	A+PTR	mail.mostro.ru
31.13.17.162	A	mail.ic-mit.ru
31.13.17.179	PTR	mail.vicstroy.ru
31.13.17.189	A+PTR	post.ssec.ru
31.13.17.189	A	ssec.ru
31.13.17.202	A	mail.baikalsea.com
31.13.17.206	A+PTR	mail.iqcapital.ru
31.13.17.213	A	ogorod.omnicom.ru
31.13.17.218	A	mail.alex-trade.ru
31.13.17.218	A	smtp.spasio.ru
31.13.17.218	A	alex-trade.ru