Robtex

Up: 58.185.64.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 58.185.80.0/21
Down right: 58.185.88.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
58.185.80.19	A	defu.idlabels-sg.com
58.185.80.19	A	mail.idlabels-sg.com
58.185.80.105	A	mail.myride.biz
58.185.80.164	A	mail.haolaihuat.com.sg
58.185.80.164	A	dongjian.com.sg
58.185.80.166	A	www.haolaihuat.com.sg
58.185.81.66	A	email.sutl.com
58.185.81.67	PTR	sutl.com
58.185.81.67	A+PTR	email.sutlcorp.com.sg
58.185.81.67	A+PTR	pop.sutlcorp.com.sg
58.185.81.68	PTR	mail.sutl.com.sg
58.185.81.68	PTR	exchange.sutlcorp.com.sg
58.185.81.68	PTR	smtp.sutlcorp.com.sg
58.185.82.98	A+PTR	mail.bescon.com.sg
58.185.82.98	A	note03.komatsu.com.sg
58.185.82.99	A	smtp1.komatsu.com.sg
58.185.82.106	PTR	rigel-fw.rigel-group.com
58.185.82.106	A	qingfeng2018.com
58.185.82.138	A	mailmav2.starmedia.bz
58.185.82.138	A	mailmav2.expand.com.sg
58.185.82.138	A	mailmav2.mediaconnection.com.sg
58.185.82.249	A	ascenstar-cms.com
58.185.83.35	A	myisams.sais.edu.sg
58.185.83.46	A	saismailer.edu.sg
58.185.83.46	A	www.mystamford.edu.sg
58.185.83.46	A	mail.saismailer.edu.sg
58.185.83.51	A+PTR	mail.megatron.com.sg
58.185.83.51	A	ns1.megatron.com.sg
58.185.83.52	A	megatron.com.sg
58.185.83.68	A	mail.pcb.com.sg
58.185.83.68	A	mail.pcbxp.com
58.185.83.68	A	mail.discountstore.com.sg
58.185.83.163	PTR	mail.hakuto.com.sg
58.185.83.163	PTR	server1.hakuto.com.sg
58.185.84.116	A+PTR	mail.sato-int.com
58.185.84.116	A	mail.satoasiapacific.com
58.185.84.116	A	mail.satogbs.com
58.185.84.126	A	exch.satoasiapacific.com
58.185.84.141	PTR	edfsmtp.manfinancial.com.sg
58.185.84.147	PTR	mail.mfglobal.com.sg
58.185.84.194	A	pridns.ezyhealth.com
58.185.84.195	A	ns1.ezyhealth.com
58.185.84.198	PTR	mail.ezyhealth.com
58.185.84.198	A	mail2.ezyhealth.com
58.185.84.198	A	mail.ezyhealth.com.sg
58.185.84.210	A+PTR	mail.nucourt.com
58.185.84.210	A	mail.aesthcourses.com
58.185.84.219	A	aaamed.org
58.185.84.244	PTR	twpsvc1.twpsin.com
58.185.84.245	A	www.meinhardt-infra.com.sg
58.185.85.119	PTR	komayaships.com.sg
58.185.85.154	A+PTR	ns1.ahtc.org.sg
58.185.85.154	PTR	ns1.hougang.org.sg
58.185.85.154	A	js5533.com
58.185.85.196	A+PTR	mail.ccn.com.sg
58.185.85.196	A	lc1.ccnexchange.com
58.185.85.197	A	dns2.ezyfreight.net
58.185.85.199	A	po1.ccnexchange.com
58.185.85.212	A	www2.ccnhub.com
58.185.85.221	A	www.ccn.com.sg
58.185.85.221	A	www.ccnhub.com
58.185.85.222	A	login.ccnhub.com
58.185.85.224	A	www.siacargo.com
58.185.85.253	A	wwwsiacargocom.wip.ccnexchange.com
58.185.86.3	A	www.agilspace.com
58.185.86.3	A	agilspace.com
58.185.86.228	A	mail.mmi.com.sg
58.185.86.229	A+PTR	smtp1.mmi.com.sg
58.185.86.229	PTR	smtp1.precisionmagnetics.com.sg
58.185.86.229	A	smtp1.mmi.sg
58.185.86.230	A	outmail.mmi.com.sg
58.185.86.251	A	webmail.mmi.com.sg
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
58.185.90.107	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