Robtex

Up: 211.232.40.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 211.232.40.0/23
Down right: 211.232.42.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
211.232.40.33	PTR	static.211-232-40-33.nexg.net
211.232.41.15	PTR	static.211-232-41-15.nexg.net
211.232.41.58	PTR	static.211-232-41-58.nexg.net
211.232.41.74	PTR	static.211-232-41-74.nexg.net
211.232.41.74	A	watchcop.net
211.232.41.132	PTR	static.211-232-41-132.nexg.net
211.232.42.4	PTR	static.211.232.42.4
211.232.42.4	A	fidelix.co.kr
211.232.42.4	A	www.fidelix.co.kr
211.232.42.5	A+PTR	mail.fidelix.co.kr
211.232.42.6	PTR	static.211.232.42.6
211.232.42.6	A	mail.fidelix.co.kr
211.232.42.8	PTR	static.211.232.42.8
211.232.42.24	PTR	static.211.232.42.24
211.232.42.131	A	pus.pilship.com
211.232.42.182	PTR	static.211.232.42.182
211.232.43.18	PTR	static.211-232-43-18.nexg.net
211.232.43.19	PTR	static.211-232-43-19.nexg.net
211.232.43.192	PTR	static.211-232-43-192.nexg.net
211.232.43.194	PTR	static.211-232-43-194.nexg.net
211.232.43.250	PTR	static.211-232-43-250.nexg.net