Robtex

Up: 211.232.0.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 211.232.0.0/23
Down right: 211.232.2.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
211.232.0.0	PTR	static.211-232-0-0.nexg.net
211.232.0.36	PTR	static.211-232-0-36.nexg.net
211.232.0.249	PTR	static.211-232-0-249.nexg.net
211.232.0.255	PTR	static.211-232-0-255.nexg.net
211.232.1.1	PTR	ns5.nexg.net
211.232.1.2	PTR	ns6.nexg.net
211.232.1.3	PTR	ns3.nexg.net
211.232.1.5	PTR	www.nexg.net
211.232.1.54	PTR	static.211-232-1-54.nexg.net
211.232.1.94	PTR	static.211-232-1-94.nexg.net
211.232.1.94	A	www.goodkiss.co.kr
211.232.1.94	A	goodkiss.co.kr
211.232.1.103	PTR	static.211-232-1-103.nexg.net
211.232.1.103	A	mail.hotelxml.com
211.232.1.118	PTR	static.211-232-1-118.nexg.net
211.232.1.121	A+PTR	smtp4.itank.net
211.232.2.2	PTR	static.211-232-2-2.nexg.net
211.232.2.20	A+PTR	mw.nice.co.kr
211.232.2.20	A	mail.nicepni.co.kr
211.232.2.20	A	mail.niceamc.co.kr
211.232.3.2	PTR	static.211-232-3-2.nexg.net
211.232.3.30	PTR	static.211-232-3-30.nexg.net
211.232.3.55	PTR	static.211-232-3-55.nexg.net
211.232.3.103	PTR	static.211-232-3-103.nexg.net
211.232.3.153	PTR	static.211-232-3-153.nexg.net