Robtex

Up: 221.133.16.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 221.133.16.0/24
Down right: 221.133.17.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
221.133.16.2	A	*.137.70-static.reverse.anhvip.com
221.133.16.2	A	mekongpearl.net
221.133.16.2	A	8-static.reverse.anhvip.com
221.133.16.4	A	mail.truyenthongquangcao.com
221.133.16.4	A	nongnghiepdongbang.com
221.133.16.7	A	a638.phobos.chosang.vn
221.133.16.7	A	bdg-hn.com.vn
221.133.16.7	A	jerry.euro.chosang.vn
221.133.16.9	A	mail.vn.name.vn
221.133.16.15	A	mail.thaihoagroup.vn
221.133.16.15	A	vietnam-tour-operator.info
221.133.16.15	A	mail.quatang68.vn
221.133.16.17	A	thcsleloihd.edu.vn
221.133.16.17	A	www.thcsleloihd.edu.vn
221.133.16.17	A	bachngoc.vn
221.133.16.21	A	mail.vtv.com.vn
221.133.16.21	A	vtv.com.vn
221.133.16.22	A	*.thietkenhadep.vn
221.133.16.22	A	hostmaster.thietkenhadep.vn
221.133.16.22	A	mail.thaihoagroup.com
221.133.16.25	A	ketban247.vn
221.133.16.25	A	www.vnclouds.com
221.133.16.25	A	mail.nhactre.pro.vn
221.133.16.26	A	lvt.com.vn
221.133.16.198	A	webmail.hc.com.vn
221.133.17.10	A+PTR	mail.pvc.vn
221.133.17.26	A	nongnghieptunhien.com
221.133.17.36	A	www.vietnamtotnhat.com
221.133.17.36	A	vietnamtotnhat.com
221.133.17.37	A	www.tapchithue.com.vn
221.133.17.37	A	tapchithue.com.vn
221.133.17.81	A	mail.saigonpost.com.vn
221.133.17.81	A	saigonpost.com.vn
221.133.17.90	A	specials.tienphong.vn
221.133.17.98	A+PTR	mail.drvn.gov.vn
221.133.17.98	A	mail.vnexpressway.gov.vn
221.133.17.100	A	drvn.gov.vn
221.133.17.102	A	drvn.gov.vn
221.133.17.102	A	drvn.mt.gov.vn
221.133.17.140	A+PTR	svr1.sysvn.com
221.133.17.140	A	ns3.sysvn.com
221.133.17.140	A	duoclieuplaza.com
221.133.17.141	PTR	svr1.sysvn.com