Robtex

Up: 5.129.0.0/16
Can't show all results, try to descend to a more specific CIDR
Down left: 5.129.0.0/18
Down right: 5.129.64.0/18
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
5.129.0.0	PTR	l5-129-0-0.cn.ru
5.129.4.2	PTR	l5-129-4-2.cn.ru
5.129.4.33	A	esysm.ru
5.129.5.231	A	usa.infranet.su
5.129.8.0	PTR	l5-129-8-0.cn.ru
5.129.8.20	A	mx2.rosbt.ru
5.129.16.0	PTR	l5-129-16-0.cn.ru
5.129.16.151	A	sibtechgaz.ru
5.129.18.2	A+PTR	mail.virtsystem.com
5.129.18.2	A	audiobrending.ru
5.129.18.2	A	papapanda.info
5.129.23.20	A	mail.ax-nsk.com
5.129.23.20	A	ns.ax-nsk.ru
5.129.23.20	A	www.ax-nsk.ru
5.129.24.0	PTR	l5-129-24-0.cn.ru
5.129.27.47	A	point54.ru
5.129.31.2	PTR	l5-129-31-2.cn.ru
5.129.31.73	A	sib-mk.ru
5.129.32.0	PTR	l5-129-32-0.cn.ru
5.129.37.46	A	mx.napaster.name
5.129.37.46	A	napaster.name
5.129.37.46	A	fiv.red
5.129.39.3	PTR	l5-129-39-3.cn.ru
5.129.40.0	PTR	l5-129-40-0.cn.ru
5.129.42.74	A	al54.tk
5.129.43.2	PTR	l5-129-43-2.cn.ru
5.129.46.8	A	alexey-ig.online
5.129.48.0	PTR	l5-129-48-0.cn.ru
5.129.55.172	A	palchukovsky.com
5.129.56.0	PTR	l5-129-56-0.cn.ru
5.129.56.24	A	katton.biz
5.129.56.24	A	www.katton.biz
5.129.59.3	PTR	l5-129-59-3.cn.ru
5.129.64.0	PTR	l5-129-64-0.cn.ru
5.129.64.48	A	mail.altreza.ru
5.129.64.48	A	xn--80aaois4an3f.xn--p1ai
5.129.64.48	A	altreza.com
5.129.66.1	PTR	l5-129-66-1.cn.ru
5.129.69.12	A	mail.hoore.ru
5.129.69.46	A	dtit.ru
5.129.72.0	PTR	l5-129-72-0.cn.ru
5.129.80.0	PTR	l5-129-80-0.cn.ru
5.129.88.0	PTR	l5-129-88-0.cn.ru
5.129.96.0	PTR	l5-129-96-0.cn.ru
5.129.100.4	A	mail.sibdor.ru
5.129.100.9	A	mail1.colorlon.ru
5.129.100.9	A	mail3.19a.ru
5.129.104.0	PTR	l5-129-104-0.cn.ru
5.129.112.0	PTR	l5-129-112-0.cn.ru
5.129.119.2	A+PTR	mail01.vtzp.ru
5.129.120.0	PTR	l5-129-120-0.cn.ru
5.129.120.22	A	mx11.promsib.com