Robtex

Up: 58.185.80.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 58.185.84.0/23
Down right: 58.185.86.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
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	A+PTR	mail.ezyhealth.com
58.185.84.198	A	mail2.ezyhealth.com
58.185.84.198	A	mail.ezyhealth.com.sg
58.185.84.200	A	mail.drhub.com
58.185.84.206	A	mail.advantagehealthbenefits.com
58.185.84.207	A	ezyhealthholdings.com
58.185.84.207	A	www.ezyhealthholdings.com
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
58.185.85.204	A	siawebtrack.com
58.185.85.204	A	sqwebtrk.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
58.185.85.222	A	ccncdn.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