Robtex

Up: 123.31.36.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 123.31.38.0/24
Down right: 123.31.39.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.31.38.5	PTR	static.vnpt.vn
123.31.38.69	PTR	static.vnpt.vn
123.31.38.72	PTR	static.vnpt.vn
123.31.38.73	PTR	static.vnpt.vn
123.31.38.73	A	jxdaiviet.mobi
123.31.38.73	A	mail.jxdaiviet.mobi
123.31.38.79	PTR	static.vnpt.vn
123.31.38.80	PTR	localhost
123.31.38.80	A	docbavolam.mobi
123.31.38.80	A	mail.docbavolam.mobi
123.31.38.85	PTR	static.vnpt.vn
123.31.38.85	A	www.muvn-free.com
123.31.38.86	PTR	static.vnpt.vn
123.31.38.86	A	muvuapkvn.com
123.31.38.91	PTR	static.vnpt.vn
123.31.38.91	A	mudeploan.com
123.31.38.92	PTR	static.vnpt.vn
123.31.38.95	PTR	static.vnpt.vn
123.31.38.95	A	tieungaovosong.org
123.31.38.97	PTR	static.vnpt.vn
123.31.38.97	A	www.mu-haiduong.com
123.31.38.98	PTR	localhost
123.31.38.98	A	muvietnamsv.com
123.31.38.100	PTR	static.vnpt.vn
123.31.38.100	A	munhansu.com
123.31.38.102	PTR	static.vnpt.vn
123.31.38.102	A	mu-keeppont.com
123.31.38.114	PTR	static.vnpt.vn
123.31.38.114	A	www.bagi.com.vn
123.31.38.114	A	thuongdo.vn
123.31.38.119	PTR	static.vnpt.vn
123.31.38.119	A	professionalcheckingsystem.com
123.31.38.121	PTR	localhost
123.31.38.121	A	anhvinh.com
123.31.38.121	A	quanlyxekhach.com
123.31.38.122	PTR	static.vnpt.vn
123.31.38.123	PTR	localhost
123.31.38.123	A	mail.khanhpoly.com
123.31.38.123	A	khanhpoly.com
123.31.38.124	PTR	static.vnpt.vn
123.31.38.124	A	kienza.com
123.31.38.126	PTR	static.vnpt.vn
123.31.38.126	A	storage.haiquanonline.com.vn
123.31.38.126	A	media.haiquanonline.com.vn
123.31.38.136	PTR	static.vnpt.vn
123.31.38.136	A	aotienvandon.com
123.31.38.136	A	batdongsanmaiquyen.com
123.31.38.138	PTR	static.vnpt.vn
123.31.38.138	A	www.easyinvoice.vn
123.31.38.138	A	www.easyon.vn
123.31.38.140	PTR	static.vnpt.vn
123.31.38.140	A	huongzini.com
123.31.38.151	A+PTR	mail.softdreams.vn
123.31.38.151	A	mail.easyon.vn
123.31.38.151	A	mail.easyinvoice.vn
123.31.38.152	PTR	static.vnpt.vn
123.31.38.152	A	banhtrungthubaophuong.com
123.31.38.152	A	asianrubyparkview.com
123.31.38.154	PTR	localhost
123.31.38.154	A	chuabenhdaday.vn
123.31.38.154	A	mail.ga68.com.vn
123.31.38.155	PTR	static.vnpt.vn
123.31.38.156	PTR	static.vnpt.vn
123.31.38.156	A	www.vienthongvnpt.vn
123.31.38.156	A	vienthongvnpt.vn