Robtex

Up: 58.185.80.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 58.185.88.0/22
Down right: 58.185.92.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
58.185.88.70	A	mail.cosco.com.sg
58.185.88.70	A	smtp.coscofeoso.com.sg
58.185.88.115	A+PTR	fe.siac.org.sg
58.185.88.115	A	mail.siac.org.sg
58.185.88.145	A+PTR	110ei.hoyu.com.sg
58.185.88.194	A	mail.pixel.com.sg
58.185.89.130	A+PTR	mx.apc.com.sg
58.185.89.130	A+PTR	mx.ase.com.sg
58.185.89.131	PTR	mx2.ase.com.sg
58.185.89.131	A+PTR	mx2.apc.com.sg
58.185.89.210	PTR	hwpdc.hockhuagroup.com.sg
58.185.89.210	A	hockhuagroup.com.sg
58.185.89.210	A	sunkee.com.sg
58.185.90.9	A	mail.filtrex-tech.com
58.185.90.46	A+PTR	mail.allianceconcrete.com.sg
58.185.90.60	A+PTR	mail.unionservices.com.sg
58.185.90.62	A	mail2.unionservices.com.sg
58.185.90.99	PTR	mail.groupind.com
58.185.90.100	PTR	ns3.ahtc.org.sg
58.185.90.100	A+PTR	ns3.hougang.org.sg
58.185.90.100	A	ns2.fca.com.sg
58.185.90.106	A+PTR	mail.groupind.com.sg
58.185.90.106	A	ns1.anikamy.com
58.185.90.106	A	mail.groupindustries.com
58.185.90.107	PTR	mail2.groupind.com.sg
58.185.90.107	A	ns3.hougang.org.sg
58.185.90.151	A+PTR	mail.novelty.com.sg
58.185.90.195	PTR	mail.prestige.com.sg
58.185.90.198	A+PTR	mail.prestige.com.sg
58.185.90.198	A	owa.prestige.com.sg
58.185.90.202	PTR	owa.prestige.com.sg
58.185.90.202	A	mail2.prestige.com.sg
58.185.90.202	A	prestigeindo.com
58.185.91.10	A	mail.distell.com.sg
58.185.91.22	A	mail.og-services.com
58.185.91.22	A	og-services.com
58.185.91.22	A	*.og-services.com
58.185.92.34	A	mail.pcsvms.com.sg
58.185.92.35	A	pcsvms.com.sg
58.185.92.35	A	www.pcsvms.com.sg
58.185.93.29	A	ns2.wnsvc.com
58.185.93.52	PTR	ckhnotes.ckh.com.sg
58.185.93.52	A	www.chankokhong.com.sg
58.185.93.52	A	chankokhong.com.sg
58.185.93.53	A	melvillepark.sg
58.185.93.54	PTR	smtp.chankokhong.com.sg
58.185.93.100	PTR	bbsmail.bbspr.com.sg
58.185.93.132	A+PTR	email.zicomgroup.com
58.185.93.132	A	mail.orionsi.com
58.185.93.132	A	mail.cescoaustralia.com
58.185.93.139	A	mailgateway.zicomgroup.com
58.185.93.149	PTR	barracuda.rokko.com.sg
58.185.93.252	A	mail1.ipacademy.com.sg
58.185.94.98	A	mail.securitymanagement.com.sg
58.185.94.99	A	mail.securitymanagement.sg
58.185.95.11	A+PTR	mx02.peceng.com
58.185.95.119	A	nanoappstore.com
58.185.95.194	A	mavenm.com
58.185.95.199	PTR	iprac.com
58.185.95.199	PTR	saper-malaysia.com
58.185.95.199	PTR	insas.net