Robtex

Up: 203.171.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 203.171.16.0/23
Down right: 203.171.18.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.171.16.0	PTR	static.cmcti.vn
203.171.16.1	PTR	ngt.vn
203.171.16.76	PTR	mail.ngt.vn
203.171.16.83	PTR	static.cmcti.vn
203.171.16.83	A	tnteco.vn
203.171.16.86	PTR	static.cmcti.vn
203.171.16.86	A	www.tnh-hotels.vn
203.171.16.87	A+PTR	email1.tniholdings.vn
203.171.16.87	PTR	email1.mtalent.com.vn
203.171.16.87	PTR	email1.tnssecurity.com.vn
203.171.16.88	PTR	email3.tniholdings.vn
203.171.16.88	A+PTR	email3.tncgroup.com.vn
203.171.16.88	PTR	email3.vidgroup.com.vn
203.171.16.89	PTR	static.cmcti.vn
203.171.16.90	PTR	static.cmcti.vn
203.171.16.110	PTR	static.cmcti.vn
203.171.16.110	A	anhbangke.gso.gov.vn
203.171.17.1	PTR	static.cmcti.vn
203.171.17.71	PTR	static.cmcti.vn
203.171.17.71	A	campaign.vsmart.net
203.171.19.5	PTR	static.cmcti.vn
203.171.19.5	A	ut87.v.bsclink.cn
203.171.19.5	A	ut87.v.trpcdn.net
203.171.19.7	PTR	static.cmcti.vn
203.171.19.7	A	ut87.v.bsclink.cn
203.171.19.7	A	ut87.v.trpcdn.net
203.171.19.98	PTR	static.cmcti.vn
203.171.19.98	A	lltp.moj.gov.vn
203.171.19.99	PTR	static.cmcti.vn
203.171.19.99	A	tlthads1.moj.gov.vn
203.171.19.101	PTR	static.cmcti.vn
203.171.19.101	A	tuoitrebtp.moj.gov.vn
203.171.19.101	A	ptslw.moj.gov.vn
203.171.19.102	PTR	static.cmcti.vn
203.171.19.102	A	hotich.moj.gov.vn
203.171.19.102	A	hotich1.moj.gov.vn