Robtex

Up: 211.49.224.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 211.49.224.0/24
Down right: 211.49.225.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
211.49.224.23	PTR	smtp043.korea.com
211.49.224.26	PTR	smtp026.korea.com
211.49.224.57	PTR	r-smtp4.korea.com
211.49.224.58	PTR	r-smtp5.korea.com
211.49.224.60	PTR	r-smtp3.korea.com
211.49.225.31	A	p3s.neocdn.co.kr
211.49.225.42	A	p3s.neocdn.co.kr
211.49.225.135	A	www.kuaipass.com
211.49.225.135	A	bswalking.org
211.49.225.135	A	goodnamemanager.co.kr
211.49.225.160	A	ns.star-11.com
211.49.225.160	A	star-11.com
211.49.225.161	A	leiquan.website