Robtex

Up: 211.232.136.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 211.232.136.0/23
Down right: 211.232.138.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
211.232.136.69	PTR	static.211-232-136-69.nexg.net
211.232.136.69	A	ns.yjsteco.com
211.232.136.69	A	yjstcex.yjsteco.com
211.232.137.150	PTR	mail.mnsoft.co.kr
211.232.137.185	PTR	spam.hyundai-mnsoft.com
211.232.138.2	PTR	static.211-232-138-2.nexg.net
211.232.138.2	A	mail.3ssoftware.com
211.232.138.2	A	mail.3ssoft.com
211.232.138.25	PTR	static.211-232-138-25.nexg.net
211.232.138.25	A	mail.3ssoft.co.kr
211.232.138.168	PTR	static.211-232-138-168.nexg.net
211.232.138.181	PTR	static.211-232-138-181.nexg.net
211.232.138.181	A	mail.vertexsync.com
211.232.138.200	PTR	static.211-232-138-200.nexg.net
211.232.138.200	A	mail.cubecore.co.kr
211.232.139.2	A	www.winixinfo.co.kr
211.232.139.2	A	winixinfo.co.kr
211.232.139.131	PTR	static.211-232-139-131.nexg.net
211.232.139.131	A	www.kmcca.or.kr
211.232.139.132	PTR	static.211-232-139-132.nexg.net
211.232.139.137	PTR	static.211-232-139-137.nexg.net
211.232.139.137	A	kmcca.or.kr
211.232.139.137	A	ns.kmcca.or.kr
211.232.139.141	PTR	static.211-232-139-141.nexg.net