Robtex

Up: 123.31.36.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 123.31.36.0/25
Down right: 123.31.36.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.31.36.3	PTR	localhost
123.31.36.3	A	vnptpay.vn
123.31.36.3	A	vinaphone.vnptpay.vn
123.31.36.4	A	api.vnptpay.vn
123.31.36.5	A	admin.vnptpay.vn
123.31.36.7	PTR	localhost
123.31.36.18	A	tvhay.vn
123.31.36.18	A	www.tvhay.vn
123.31.36.24	PTR	localhost
123.31.36.24	A	ceeme.vn
123.31.36.33	A	www.vtruyen.com.vn
123.31.36.33	A	vtruyen.com.vn
123.31.36.34	A	www.vascloud.com.vn
123.31.36.42	A	www.myshopbrand.vn
123.31.36.43	PTR	localhost
123.31.36.43	A	myenglish.com.vn
123.31.36.45	A	ads.vascloud.com.vn
123.31.36.66	A	www.2friends.com.vn
123.31.36.66	A	2friends.com.vn
123.31.36.69	PTR	localhost
123.31.36.69	A	chinese.baoquangninh.com.vn
123.31.36.69	A	english.baoquangninh.com.vn
123.31.36.75	PTR	localhost
123.31.36.75	A	baohagiang.vn
123.31.36.75	A	baohungyen.org.vn
123.31.36.101	A	www.mcover.vn
123.31.36.101	A	mcover.vn
123.31.36.102	A	www.myenglish.com.vn
123.31.36.102	A	vas.myenglish.com.vn
123.31.36.103	A	superinfo.vn
123.31.36.118	PTR	localhost
123.31.36.118	A	www.baodanang.vn
123.31.36.118	A	www.qtv.vn
123.31.36.121	A	www.myhomework.vn
123.31.36.131	A	bvdkbuudien.com.vn
123.31.36.137	A	phim18h.vn
123.31.36.147	A	www.vnptapi.com
123.31.36.150	A	store.vinaphone.vn
123.31.36.156	A	trungngay1ty.vn
123.31.36.161	A	m.vnptpay.vn
123.31.36.170	PTR	localhost
123.31.36.170	A	api-myvnpt.vnpt.vn
123.31.36.171	A	image-myvnpt.vnptvas.com
123.31.36.173	PTR	localhost
123.31.36.173	A	vnpt.vn
123.31.36.183	PTR	localhost
123.31.36.183	A	vn.alome.vn
123.31.36.235	PTR	localhost
123.31.36.235	A	vinaphone.com.vn
123.31.36.235	A	vnpt.com.vn