Robtex

Up: 58.185.32.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 58.185.48.0/21
Down right: 58.185.56.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
58.185.48.8	A	mx1.fareast.com.sg
58.185.48.9	A	mx2.fareast.com.sg
58.185.48.147	A+PTR	webmail.concordehotel.com.sg
58.185.48.148	A+PTR	mail.concordehotel.com.sg
58.185.48.173	PTR	smtp2.camfilfarr.net
58.185.49.18	A	dns2.fsmtech.com
58.185.49.18	A	dns1.fsmtech.com
58.185.49.18	A	jupiter.fsmtech.com
58.185.49.19	A	fsmtech.com
58.185.49.99	PTR	exchange.framework.sg
58.185.49.202	A	www.mitsui-soko.com.sg
58.185.52.17	A	www.cnt.com.sg
58.185.52.17	A	justattach.com
58.185.52.17	A	oily101.com
58.185.52.46	A	smtp.esplanade.com
58.185.52.46	A	rd1.esplanade.com
58.185.53.23	A	ns2.issgroup.com.au
58.185.53.23	A	ns2.isspl.com.au
58.185.53.117	A	mail.unixsolve.com
58.185.53.193	A	globe3.tomoe.com.sg
58.185.53.193	A	web.microsoftion.com
58.185.54.83	A	mail.national.sg
58.185.54.83	A	mail.ssl.sg
58.185.54.88	A	brightmail.national.sg
58.185.54.98	PTR	sts.sg
58.185.54.145	A	mail.icdlap.com
58.185.54.181	PTR	bcsgcs001.bilcare.com
58.185.54.217	A	interfoood.com
58.185.55.4	PTR	email.qsadvertising.com.sg
58.185.55.4	A	email.qs.sg
58.185.55.10	A+PTR	mail.qs.sg
58.185.55.10	A	mail.qsprint.com.sg
58.185.55.18	A	vaniah.com
58.185.55.114	A	taksg-exchg-svr.tak.sg
58.185.56.9	A	etexc2003.estatetrust.com.sg
58.185.56.88	PTR	manuel.isis.com
58.185.56.88	A	manuel.isis.com.sg
58.185.56.90	A	mx1.heidrick-apac.com
58.185.56.90	A	mail.isis.com.sg
58.185.56.218	PTR	gateway.sembawanggolf.org.sg
58.185.56.218	A	www.sembawanggolf.org.sg
58.185.57.21	A	sgcyberlock.com
58.185.58.46	A	www.hkawards.com.sg
58.185.58.243	A+PTR	mail.aplusiasia.com
58.185.59.75	A+PTR	jiro.agacorp.com.sg
58.185.59.88	A+PTR	smtp.icprc.com
58.185.59.88	A	icprc.com
58.185.59.178	A	jobsnet.com.sg
58.185.59.178	A	jobsnet.com.my
58.185.59.182	PTR	mail.caliber.com.sg
58.185.59.182	PTR	mail.jpsolutions.com.sg
58.185.59.182	PTR	mail.jptech.com.sg
58.185.59.185	A	mail.ws.sg
58.185.61.90	A	ctservices.ddns.net