Robtex

Up: 123.31.28.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 123.31.29.0/25
Down right: 123.31.29.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.31.29.4	PTR	localhost
123.31.29.11	PTR	localhost
123.31.29.13	PTR	localhost
123.31.29.14	PTR	localhost
123.31.29.14	A	nets.vn
123.31.29.19	PTR	localhost
123.31.29.19	A	vothanttl.123game.vn
123.31.29.19	A	chaviet.com
123.31.29.21	A	jqkserver.com
123.31.29.22	A	mvb.vn
123.31.29.22	A	mail.mvb.vn
123.31.29.25	PTR	localhost
123.31.29.25	A	lord3k.com
123.31.29.26	PTR	static.vnpt.vn
123.31.29.26	A	hoighepthan.com
123.31.29.34	PTR	localhost
123.31.29.42	PTR	localhost
123.31.29.42	A	1mail.test.123game.vn
123.31.29.45	PTR	localhost
123.31.29.47	PTR	localhost
123.31.29.47	A	mail.aihuebakery.com
123.31.29.47	A	mail.goldbeetleapp.com
123.31.29.48	PTR	localhost
123.31.29.48	A	mx2.oneworld.vn
123.31.29.52	PTR	localhost
123.31.29.54	PTR	static.vnpt.vn
123.31.29.57	PTR	localhost
123.31.29.60	PTR	localhost
123.31.29.75	PTR	static.vnpt.vn
123.31.29.75	A	oneworld.vn
123.31.29.77	PTR	static.vnpt.vn
123.31.29.78	PTR	localhost
123.31.29.79	PTR	static.vnpt.vn
123.31.29.79	A	thiencucpk.123game.vn
123.31.29.79	A	tandevuong.com
123.31.29.80	PTR	localhost
123.31.29.83	PTR	localhost
123.31.29.97	PTR	static.vnpt.vn
123.31.29.115	PTR	static.vnpt.vn
123.31.29.117	PTR	static.vnpt.vn
123.31.29.122	PTR	localhost
123.31.29.126	PTR	static.vnpt.vn
123.31.29.133	PTR	localhost
123.31.29.134	PTR	localhost
123.31.29.134	A	nghiemthuthanhtoan.com
123.31.29.134	A	www.thanhquyettoan.com
123.31.29.136	PTR	localhost
123.31.29.136	A	mail.khosimmobi.net
123.31.29.136	A	mail.phongthuysodep.net
123.31.29.137	A	kasati.edu.vn
123.31.29.139	PTR	localhost
123.31.29.139	A	www.xemphim24h.net
123.31.29.139	A	chanphom.com
123.31.29.143	PTR	localhost
123.31.29.143	A	simsodepphongthuy.net
123.31.29.143	A	simhoptuoi.com.vn
123.31.29.144	PTR	localhost
123.31.29.144	A	kowon.vn
123.31.29.144	A	www.kowon.vn
123.31.29.145	PTR	localhost
123.31.29.145	A	win123.club
123.31.29.145	A	s2.bigkool.net
123.31.29.148	PTR	localhost
123.31.29.148	A	www.hoahoctro.vn
123.31.29.148	A	hoahoctro.vn
123.31.29.149	PTR	localhost
123.31.29.151	A	crm.h2vn.technology
123.31.29.152	A	qlcl.vn
123.31.29.152	A	www.qlcl.vn
123.31.29.153	A	botmes.com
123.31.29.153	A	www.botmes.com
123.31.29.158	A	truytimtrieuphu.com
123.31.29.159	PTR	localhost
123.31.29.159	A	azgame.vn
123.31.29.160	A	congnapthe.com
123.31.29.167	A	gamevongquay.com
123.31.29.167	A	vongquayonline.com
123.31.29.167	A	xnbetong3.com
123.31.29.173	PTR	localhost
123.31.29.173	A	jmgo.vn
123.31.29.173	A	www.tvboxdanang.com
123.31.29.176	A	ozze.club
123.31.29.177	A	congchungthaiha.com
123.31.29.178	PTR	localhost
123.31.29.178	A	www.weldcom.vn
123.31.29.178	A	www.cokhicu.vn
123.31.29.180	A	kientrucnhaphuongbac.com
123.31.29.180	A	bomvip.net
123.31.29.181	A	www.onbooking.com
123.31.29.184	PTR	localhost
123.31.29.184	A	dichvudietmoi.com
123.31.29.184	A	thuoctrumoi.net
123.31.29.194	PTR	localhost
123.31.29.198	A	novfastpay.com
123.31.29.202	A	shiningsun.com.vn
123.31.29.204	A	cms.hacknao.vn