Robtex

Up: 123.31.40.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 123.31.41.0/25
Down right: 123.31.41.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.31.41.1	PTR	localhost
123.31.41.9	A	mail.vietnamson.com
123.31.41.9	A	vietnamson.com
123.31.41.9	A	srohoaphung.com
123.31.41.10	PTR	localhost
123.31.41.10	A	mail.iphonehoanghuy.com
123.31.41.10	A	mail.chualuonghai.com
123.31.41.11	PTR	localhost
123.31.41.11	A	www.mobitrip.net
123.31.41.11	A	evatimes.com
123.31.41.13	PTR	localhost
123.31.41.13	A	bytesoft.vn
123.31.41.13	A	cbvietnam.com
123.31.41.14	A	srousd.com
123.31.41.16	PTR	localhost
123.31.41.16	A	mail.alo5giay.vn
123.31.41.16	A	mail2.diaocphucthien.com
123.31.41.18	A	mail.trungtamhanhhuongsokien.org
123.31.41.18	A	trungtamhanhhuongsokien.org
123.31.41.19	PTR	localhost
123.31.41.20	A	wrtlink.com
123.31.41.24	PTR	localhost
123.31.41.24	A	catchyenglish.com
123.31.41.24	A	deptuoi30.com
123.31.41.25	A	bietthuvinhomesthanhhoa.com
123.31.41.25	A	blog.linkfile.mobi
123.31.41.25	A	vinfast-vn.com
123.31.41.27	A	mail.dienoto.net
123.31.41.28	PTR	localhost
123.31.41.28	A	seothue.edu.vn
123.31.41.29	A	srokynguyen.com
123.31.41.30	PTR	localhost
123.31.41.30	A	hbmcquocte.com
123.31.41.30	A	noihoicongnghiep.net
123.31.41.31	PTR	mail.dayamthuc.vn
123.31.41.31	A+PTR	sv.goweb247.com
123.31.41.31	A	ns2.dayamthuc.vn
123.31.41.32	PTR	static.vnpt.vn
123.31.41.32	A	caodangyhanoi.com.vn
123.31.41.32	A	cdktks-dl.edu.vn
123.31.41.33	A	duanaeresort.com
123.31.41.33	A	pedinivn.com
123.31.41.33	A	mail.duanaeresort.com
123.31.41.34	A	thinhca.com
123.31.41.34	A	self-care.vn
123.31.41.34	A	dogophungha.com
123.31.41.35	PTR	static.vnpt.vn
123.31.41.35	A	mail.redriverbbqs.com
123.31.41.35	A	lequocdc.com
123.31.41.38	A	mail.tailieugiaoduc.vn
123.31.41.38	A	dethithudaihoc2020.com
123.31.41.38	A	dethithu2020.net
123.31.41.39	PTR	localhost
123.31.41.39	A	bom.com.vn
123.31.41.39	A	giaybom.com
123.31.41.40	PTR	localhost
123.31.41.40	A	hoagiayletuong.com
123.31.41.40	A	sumshop.net
123.31.41.43	A	www.marketingwifi2019.tk
123.31.41.43	A	marketingwifi2019.tk
123.31.41.44	PTR	localhost
123.31.41.44	A	tieudung.edu.vn
123.31.41.44	A	alt1.aspmx.l.google.com.hanoi-times.net
123.31.41.46	A	motocyber.com
123.31.41.46	A	giaynuxinh.com
123.31.41.46	A	replyfb.com
123.31.41.49	A	mail.orientalwestlakehotay.com
123.31.41.49	A	orientalwestlakehotay.com
123.31.41.50	A	mail.royalgardenbavi.com
123.31.41.50	A	www.treolongmay.vn
123.31.41.50	A	royalgardenbavi.com
123.31.41.51	PTR	localhost
123.31.41.51	A	gumac.vn
123.31.41.52	A	motchu.com
123.31.41.52	A	livechatsale.com
123.31.41.54	PTR	localhost
123.31.41.55	A	kingorder168.com
123.31.41.55	A	shield-b.com
123.31.41.55	A	xaydungiamy.com
123.31.41.58	PTR	localhost
123.31.41.58	A	hoachatphubinh.com
123.31.41.58	A	www.hoachatphubinh.com
123.31.41.59	PTR	localhost
123.31.41.59	A	mustgo.vn
123.31.41.60	PTR	localhost
123.31.41.60	A	batdongsan24h.com.vn
123.31.41.61	A	sromap90.com
123.31.41.64	PTR	localhost
123.31.41.64	A	maytinhlaptopphuquoc.com
123.31.41.64	A	wifiphuquoc.com
123.31.41.66	A	thangmaybachkhoa.com
123.31.41.68	A	sro8888.com
123.31.41.68	A	mail.kientructhanhdat.com
123.31.41.68	A	kientructhanhdat.com
123.31.41.69	A	srothienma.com
123.31.41.70	A	srobatuoc.com
123.31.41.70	A	daihung120.com
123.31.41.70	A	kynguyensro.com
123.31.41.146	PTR	localhost
123.31.41.147	PTR	localhost
123.31.41.148	PTR	static.vnpt.vn
123.31.41.148	A	lhnvn.vnecdn.net
123.31.41.149	PTR	localhost
123.31.41.164	PTR	localhost
123.31.41.177	PTR	localhost
123.31.41.181	PTR	localhost
123.31.41.186	PTR	localhost
123.31.41.199	PTR	localhost
123.31.41.213	PTR	localhost
123.31.41.227	PTR	localhost
123.31.41.229	PTR	localhost
123.31.41.229	A	duaxe.tk
123.31.41.229	A	mail.vrpgame.net
123.31.41.236	PTR	localhost