Robtex

Up: 58.185.16.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 58.185.24.0/22
Down right: 58.185.28.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
58.185.24.35	PTR	mail.d-ron.com
58.185.24.35	A	ns1.d-ron.com
58.185.24.39	PTR	mail.dronsgsvr02.com
58.185.24.39	A	ns1.dronsghost.com
58.185.24.40	PTR	mail.emtec-group.com.sg
58.185.24.92	A	blaster.glceventslist.com
58.185.24.93	A	blaster.glcconferences.com
58.185.24.93	A	glcconferences.com
58.185.24.118	A+PTR	smtp.kmp.com.sg
58.185.24.118	A	smtp.foodsymphony.com.sg
58.185.24.118	A	smtp.grandedelta.com
58.185.24.126	A+PTR	exchange.globaltronic.com.sg
58.185.24.163	A+PTR	yufish-es1.yufish.com
58.185.24.202	A	360mgt.dyndns.ws
58.185.25.81	A	aeas.org.sg
58.185.25.200	A+PTR	mail.mtqpremier.com.sg
58.185.25.202	PTR	mail.mtqpremier.com.sg
58.185.25.202	A	mail.mtqpemac.com.sg
58.185.25.211	PTR	ac.arbiter.com.sg
58.185.25.211	A	ae.arbiter.com.sg
58.185.26.35	A	fw.aimcorp.com.sg
58.185.26.36	A+PTR	smtp.aimcorp.com.sg
58.185.26.36	PTR	smtp.haomart.com.sg.26.185.58.in-addr.arpa
58.185.26.36	A	smtp.amcl.com.sg
58.185.26.148	A+PTR	mx02.nittan.com.sg
58.185.27.52	A	www.mslportal.edu.sg
58.185.27.222	A+PTR	mail.hongfok.com.sg
58.185.27.222	A	mail.concourse.com.sg
58.185.27.222	A	mail1.hongfok.com.sg
58.185.28.242	A	mail.sea-rich.com.sg
58.185.29.195	A+PTR	mail.wahjooseng.com
58.185.29.195	A	mail1.canhelp.biz
58.185.30.6	A+PTR	mail.axisengg.com
58.185.30.78	PTR	mail.psmpl.com.sg
58.185.30.78	A	www.psmpl.com.sg
58.185.30.78	A	mail.parakougroup.com.sg
58.185.30.131	A	www.asianshipper.com
58.185.30.163	A	ladasp.com
58.185.30.163	A	www.microndr.com
58.185.30.163	A	microndr.com.sg
58.185.30.165	A	ladasp.com
58.185.30.243	A+PTR	mail.nichibei.com.sg
58.185.30.246	A+PTR	webmail.nichibei.com.sg