Robtex

Up: 101.99.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 101.99.16.0/23
Down right: 101.99.18.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
101.99.16.3	PTR	mail.canhsat.vn
101.99.16.88	PTR	static.cmcti.vn
101.99.16.88	A	cdx2000.net
101.99.16.88	A	vasa.vn
101.99.16.136	PTR	static.cmcti.vn
101.99.16.136	A	smp-vos-store.vsmart.net
101.99.16.136	A	smp-vos-usercontent.vsmart.net
101.99.16.138	PTR	static.cmcti.vn
101.99.16.141	PTR	static.cmcti.vn
101.99.16.141	A	forum.trachanhquan.mobi
101.99.16.147	PTR	static.cmcti.vn
101.99.16.147	A	mail.trachanhquan.mobi
101.99.16.147	A	mail.gamedangianviet.com
101.99.16.152	A	kinhdoanhonlinefb.com
101.99.16.157	A	gamechua.net
101.99.16.173	PTR	static.cmcti.vn
101.99.16.195	PTR	static.cmcti.vn
101.99.16.196	PTR	static.cmcti.vn
101.99.16.201	PTR	static.cmcti.vn
101.99.16.203	PTR	static.cmcti.vn
101.99.16.203	A	www.xzone.vn
101.99.16.223	PTR	static.cmcti.vn
101.99.16.224	A	mail.thanhtoan365.com
101.99.16.225	PTR	static.cmcti.vn
101.99.16.225	A	mail.megapayment.net.vn
101.99.16.231	PTR	static.cmcti.vn
101.99.17.1	PTR	static.cmcti.vn
101.99.17.5	PTR	static.cmcti.vn
101.99.17.13	PTR	static.cmcti.vn
101.99.17.14	PTR	static.cmcti.vn
101.99.17.17	PTR	static.cmcti.vn
101.99.17.38	PTR	static.cmcti.vn
101.99.17.47	PTR	static.cmcti.vn
101.99.17.48	PTR	static.cmcti.vn
101.99.17.48	A	bshc.com.vn
101.99.17.54	PTR	static.cmcti.vn
101.99.17.60	PTR	static.cmcti.vn
101.99.17.71	A	vietnam-attractions.net
101.99.17.93	PTR	static.cmcti.vn
101.99.17.98	PTR	static.cmcti.vn
101.99.17.113	PTR	static.cmcti.vn
101.99.17.114	PTR	static.cmcti.vn
101.99.17.121	PTR	static.cmcti.vn
101.99.17.129	PTR	static.cmcti.vn
101.99.17.130	PTR	static.cmcti.vn
101.99.17.135	PTR	static.cmcti.vn
101.99.17.135	A	cucytegiaothong.mt.gov.vn
101.99.17.138	PTR	static.cmcti.vn
101.99.17.142	PTR	static.cmcti.vn
101.99.17.142	A	vr.mot.gov.vn
101.99.17.143	PTR	static.cmcti.vn
101.99.17.143	A	viwa.mot.gov.vn
101.99.17.144	PTR	static.cmcti.vn
101.99.17.144	A	www.caa.mt.gov.vn
101.99.17.148	PTR	static.cmcti.vn
101.99.17.158	PTR	static.cmcti.vn
101.99.17.166	PTR	static.cmcti.vn
101.99.17.170	PTR	static.cmcti.vn
101.99.17.187	PTR	static.cmcti.vn
101.99.17.191	PTR	static.cmcti.vn
101.99.17.195	PTR	static.cmcti.vn
101.99.17.201	PTR	static.cmcti.vn
101.99.17.205	PTR	static.cmcti.vn
101.99.17.220	PTR	static.cmcti.vn
101.99.17.227	PTR	static.cmcti.vn
101.99.17.228	PTR	static.cmcti.vn
101.99.17.233	PTR	static.cmcti.vn
101.99.17.237	PTR	static.cmcti.vn
101.99.18.10	PTR	static.cmcti.vn
101.99.18.18	PTR	static.cmcti.vn
101.99.18.26	PTR	mail.antv.gov.vn
101.99.18.41	PTR	static.cmcti.vn
101.99.18.51	PTR	static.cmcti.vn
101.99.18.51	A	www.hchomecenter.com.vn
101.99.18.51	A	hchomecenter.com.vn
101.99.18.52	A+PTR	webmail.hc.com.vn
101.99.18.52	A	giaiphapaohoa.net
101.99.18.56	PTR	static.cmcti.vn
101.99.18.74	PTR	mail.hoaphat.com.vn
101.99.18.74	A	www.hoaphat.com.vn
101.99.18.74	A	www.hoaphat.vn
101.99.18.75	A+PTR	mail.hoaphat.com.vn
101.99.18.76	PTR	mail.hoaphat.com.vn
101.99.18.76	A	hoaphat.com
101.99.18.76	A	www.hoaphat.com
101.99.18.77	A+PTR	mail.hoaphat.com.vn
101.99.18.77	A	www.hoaphat.com.vn
101.99.18.77	A	hoaphat.vn
101.99.18.88	PTR	static.cmcti.vn
101.99.18.102	A+PTR	mail.plc.com.vn
101.99.18.180	PTR	static.cmcti.vn
101.99.18.194	PTR	mail.vsm.vn
101.99.18.200	A+PTR	mail.vsm.vn
101.99.18.204	PTR	static.cmcti.vn
101.99.18.204	A	tritue.edu.vn
101.99.18.214	A	caygiongs.com
101.99.18.224	PTR	static.cmcti.vn
101.99.18.224	A	ts.edu.net.vn
101.99.18.224	A	ebook.edu.net.vn
101.99.18.225	PTR	static.cmcti.vn
101.99.18.226	PTR	static.cmcti.vn
101.99.18.230	PTR	static.cmcti.vn
101.99.18.234	PTR	static.cmcti.vn
101.99.18.237	PTR	static.cmcti.vn
101.99.18.238	PTR	static.cmcti.vn
101.99.18.239	PTR	static.cmcti.vn
101.99.19.3	PTR	static.cmcti.vn
101.99.19.20	PTR	mail.vrbank.com.vn
101.99.19.20	A	mail2.vrbank.com.vn
101.99.19.24	A+PTR	mail.vrbank.com.vn
101.99.19.43	PTR	static.cmcti.vn
101.99.19.43	A	www.sotaichinh.hanoi.gov.vn
101.99.19.59	A	apollotravel.vn
101.99.19.59	A	didulich.net
101.99.19.59	A	mail.nongduocsapa.vn
101.99.19.60	PTR	static.cmcti.vn
101.99.19.85	PTR	static.cmcti.vn
101.99.19.85	A	vienthongtinkhoahoc.org.vn
101.99.19.114	PTR	static.cmcti.vn
101.99.19.120	PTR	static.cmcti.vn
101.99.19.133	PTR	mx1.atitelecom.vn
101.99.19.194	PTR	static.cmcti.vn
101.99.19.195	PTR	static.cmcti.vn
101.99.19.195	A	thongke.gso.gov.vn
101.99.19.198	PTR	mail.gso.gov.vn
101.99.19.198	A	mail.thongke.gov.vn
101.99.19.198	A	www.thongke.gov.vn
101.99.19.211	A	mail.bbsvn.com
101.99.19.211	A	bbsvn.com
101.99.19.226	PTR	static.cmcti.vn