Robtex

Up: 221.133.0.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 221.133.16.0/21
Down right: 221.133.24.0/21
(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
221.133.16.17	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
221.133.16.198	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
221.133.18.7	A	vnmouse.biz
221.133.18.13	A	haknang.com
221.133.18.25	A	www.benhvienhuunghi.vn
221.133.18.25	A	mail.benhvienhuunghi.vn
221.133.18.25	A	huunghihospital.vn
221.133.18.43	A	iulyxpmh.rusbestdate.ru
221.133.18.43	A	htkxwolg.rfbestdate.ru
221.133.18.43	A	rusbestdate.ru
221.133.18.66	A	azon.vn
221.133.18.67	A	meishi-extractor-staging.tk
221.133.18.67	A	www.meishi-extractor-staging.tk
221.133.18.78	A	tranxuanphuong.net
221.133.18.85	A	seasonstravel.co.in
221.133.22.8	PTR	mail2208.superdatavn.com
221.133.22.8	A	mail2208.maychuemail.com
221.133.22.19	PTR	mail2219.superdatavn.com
221.133.22.19	A	mail2219.maychuemail.com
221.133.22.34	PTR	mail2234.superdatavn.com
221.133.22.34	A	mail2234.maychuemail.com
221.133.22.69	PTR	mail2269.superdatavn.com
221.133.22.69	A	mail.navetco.com.vn
221.133.22.71	PTR	mail2271.superdatavn.com
221.133.22.71	A	mail.danavacation.com
221.133.22.73	A	mail.rareginvn.com
221.133.22.75	PTR	mail2275.superdatavn.com
221.133.22.75	A	mail2275.maychuemail.com
221.133.22.81	PTR	mail2281.superdatavn.com
221.133.22.84	PTR	mail2284.superdatavn.com
221.133.22.84	A	mail.hunglongbranding.com
221.133.22.88	A+PTR	mail2288.superdatavn.com
221.133.22.88	A	mail.phuongnambook.com.vn
221.133.22.89	PTR	mail2289.superdatavn.com
221.133.22.92	A	mail.lj-asia.com
221.133.22.99	PTR	mail2299.superdatavn.com
221.133.22.99	A	mail.hoanggiangexim.com
221.133.22.101	PTR	mail22101.superdatavn.com
221.133.22.101	A	mail22101.maychuemail.com
221.133.22.102	PTR	mail22102.superdatavn.com
221.133.22.104	PTR	mail22104.superdatavn.com
221.133.22.104	A	mail.unsw.edu.vn
221.133.22.120	A	mail.vinalab.org.vn
221.133.22.121	PTR	mail22121.superdatavn.com
221.133.22.121	A	mail.ms-cap.com
221.133.22.126	PTR	mail22126.superdatavn.com
221.133.22.126	A	we41logistics.com
221.133.22.137	PTR	mail22137.superdatavn.com
221.133.22.137	A	mail.hnh.com.vn
221.133.22.137	A	mail.vietnamflowerscorp.com
221.133.22.139	PTR	mail22139.superdatavn.com
221.133.22.139	A	mx.mhe.vn
221.133.22.142	A	mail.asiadragon.com.vn
221.133.22.145	PTR	mail22145.superdatavn.com
221.133.22.145	A	mail.diamondcutter.productions
221.133.22.148	PTR	mail22148.superdatavn.com
221.133.22.148	A	mail.telelink.vn
221.133.22.148	A	mail.haihan.vn
221.133.22.162	PTR	mail22162.superdatavn.com
221.133.22.164	PTR	mail22164.superdatavn.com
221.133.22.164	A	mail22164.maychuemail.com
221.133.22.176	A+PTR	mail22176.superdatavn.com
221.133.22.178	A+PTR	mail22178.superdatavn.com
221.133.22.178	A	mail22178.maychuemail.com
221.133.22.179	PTR	mail22179.superdatavn.com
221.133.22.179	A	mail22179.maychuemail.com
221.133.22.183	PTR	mail22183.superdatavn.com
221.133.24.2	PTR	mail.quanuy1hcm.org.vn
221.133.24.3	PTR	mail.ssischool.org
221.133.24.18	PTR	mail.sst.com.vn
221.133.24.52	A	scs.spt.vn
221.133.24.61	PTR	mail.fvhospital.com.vn
221.133.26.52	A	online.pnt.edu.vn
221.133.26.82	A	sts-pool.hsc.com.vn
221.133.26.85	A	itradevip.hsc.com.vn
221.133.26.86	A	dproxy-trade.hsc.com.vn
221.133.26.88	A	mobile-trade.hsc.com.vn
221.133.26.200	PTR	mail.truongthinhco.com.vn
221.133.26.230	PTR	mail.apexshipping.com.vn
221.133.27.1	A	tuvilyso.us
221.133.27.1	A	tuvilyso.net
221.133.27.1	A	www.tuvilyso.net
221.133.27.4	PTR	namlongvn.com
221.133.27.17	PTR	ns1.porsche-vietnam.com
221.133.27.44	A	anphapetrol.vn
221.133.27.59	A	vinabenny.com