Robtex

Up: 58.181.0.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 58.181.0.0/20
Down right: 58.181.16.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
58.181.0.3	PTR	static.58.181.0.3
58.181.1.3	PTR	static.58-181-1-3.nexg.net
58.181.1.13	A	mail.duckno1.com
58.181.1.66	PTR	static.58-181-1-66.nexg.net
58.181.3.197	A	mail.unisoft.kr
58.181.3.220	A	zikimisoft.co.kr
58.181.5.68	A	sejungtrans.com
58.181.5.68	A	sejungshipping.co.kr
58.181.5.206	A	spam.easybio.co.kr
58.181.5.208	A	mail.hmcne.com
58.181.11.131	PTR	static.58-181-11-131.nexg.net
58.181.11.133	A	mail.skinnslim.com
58.181.11.133	A	mail.jeilmed.com
58.181.11.133	A	mail.daemyounggolf.com
58.181.12.136	A	www.seohai.co.kr
58.181.12.136	A	seohai.co.kr
58.181.12.137	A	mail.seohai.co.kr
58.181.14.8	A	mail.allje.net
58.181.14.8	A	allje.net
58.181.14.32	PTR	static.58-181-14-32.nexg.net
58.181.14.82	A	vs2.me
58.181.14.82	A	ns1.vs2.me
58.181.14.168	A	mail.k119.org
58.181.14.211	A	hanilsystem.co.kr
58.181.15.147	A	www.geumcheonlib.seoul.kr
58.181.15.147	A	ns.geumcheonlib.seoul.kr
58.181.15.147	A	geumcheonlib.seoul.kr
58.181.16.177	A	ns.nissiglobal.com
58.181.16.177	A	ns.wonpos.co.kr
58.181.16.177	A	ns.sos119.com
58.181.16.199	A	mail.sos119.com
58.181.16.199	A	mail.nissiglobal.com
58.181.16.251	A	mail.fkcic.or.kr
58.181.17.2	PTR	static.58-181-17-2.nexg.net
58.181.18.2	PTR	static.58-181-18-2.nexg.net
58.181.19.130	A	www.ajmax.co.kr
58.181.21.71	A	gomstore.com
58.181.21.120	A	mail.thiat.com
58.181.23.3	PTR	mail.moimstone.com
58.181.23.3	A	www.moimstone.co.kr
58.181.23.3	A	moimstone.com
58.181.24.2	PTR	static.58-181-24-2.nexg.net
58.181.24.6	A	mailx.cordial.co.kr
58.181.25.2	PTR	static.58-181-25-2.nexg.net
58.181.27.131	A	cubs.co.kr
58.181.28.2	PTR	static.58-181-28-2.nexg.net
58.181.28.37	A	miaps.net
58.181.30.146	A	itgen.net
58.181.31.195	A	donotcall.co.kr