Robtex

Up: 203.162.32.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 203.162.32.0/23
Down right: 203.162.34.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.162.32.0	PTR	static.vnpt.vn
203.162.32.17	PTR	www.dnu.edu.vn
203.162.32.18	PTR	mail.dnu.edu.vn
203.162.32.41	PTR	www.danangsoft.com.vn
203.162.32.42	PTR	mail.danangsoft.com.vn
203.162.32.45	PTR	dns1.dsp.com.vn
203.162.32.46	PTR	dns2.dsp.com.vn
203.162.33.70	PTR	static.vnpt.vn
203.162.33.250	PTR	mail6.hlhvjoc.com.vn
203.162.34.85	A	3qc.vn
203.162.34.88	PTR	static.vnpt.vn
203.162.34.88	A	picture.dzogame.vn
203.162.34.89	A	pcid.dzogame.vn
203.162.34.89	A	api.dzogame.vn
203.162.34.90	A	asiasoft.net.vn
203.162.34.199	PTR	static.vnpt.vn
203.162.34.199	A	mail.playpark.vn
203.162.34.199	A	mail.asiasoftonline.vn
203.162.34.204	A	mail.dzogame.vn
203.162.34.206	PTR	static.vnpt.vn
203.162.34.206	A	ns1.asiasoft.vn
203.162.34.207	PTR	static.vnpt.vn
203.162.34.207	A	email.3qc.vn
203.162.34.207	A	email.asiasoft.net.vn
203.162.34.209	A	email.asiasoft.net.vn
203.162.34.209	A	email.asiasoftonline.vn
203.162.34.209	A	email.playpark.vn
203.162.34.232	A	patch-ts.dzogame.vn
203.162.34.233	A	patch-ts.dzogame.vn
203.162.35.66	PTR	dnshcm.vasc.com.vn
203.162.35.76	A	websgb.vasc.com.vn
203.162.35.84	A	mail.karaoke-quynhhuong.com
203.162.35.90	PTR	buy365.buddy.vn
203.162.35.90	PTR	mail.smartgps.vn
203.162.35.103	PTR	uonline.vn
203.162.35.103	PTR	mail.buddy.vn
203.162.35.103	PTR	www.coc.vn
203.162.35.104	PTR	sms.buddy.vn
203.162.35.105	PTR	uonline.vn
203.162.35.106	A+PTR	dev.buddy.vn
203.162.35.107	PTR	stream.buddy.vn
203.162.35.108	PTR	mail.ebook4u.vn
203.162.35.109	PTR	kymdan.com.vn
203.162.35.109	A	alphavietnam.com
203.162.35.110	A	websgc.vasc.com.vn
203.162.35.118	A+PTR	data2.buddy.vn
203.162.35.119	PTR	zmail.unicomsoftware.com