Robtex

Up: 203.205.40.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 203.205.40.0/23
Down right: 203.205.42.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.205.40.76	PTR	static.cmcti.vn
203.205.40.192	PTR	static.cmcti.vn
203.205.41.34	PTR	static.cmcti.vn
203.205.41.102	PTR	static.cmcti.vn
203.205.41.208	PTR	static.cmcti.vn
203.205.41.247	PTR	static.cmcti.vn
203.205.42.10	A	www.thuvienhaichau.edu.vn
203.205.42.10	A	www.thuviencamle.edu.vn
203.205.42.10	A	thuvienhaichau.edu.vn
203.205.42.81	PTR	static.cmcti.vn
203.205.42.93	PTR	static.cmcti.vn
203.205.43.89	A	shomevietnam.vn
203.205.43.89	A	www.shomevietnam.vn
203.205.43.99	PTR	static.cmcti.vn
203.205.43.100	A	smshoctap.com
203.205.43.193	PTR	static.cmcti.vn
203.205.43.193	A	mail.tourbana.com
203.205.43.195	PTR	static.cmcti.vn
203.205.43.202	PTR	static.cmcti.vn
203.205.43.207	PTR	static.cmcti.vn