Robtex

Up: 58.87.0.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 58.87.2.0/24
Down right: 58.87.3.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
58.87.2.20	PTR	mail.assureprograms.com.au
58.87.2.24	A+PTR	exchange.liquidsb.com.au
58.87.2.24	A	exchange.liquidsb.com
58.87.2.27	A+PTR	mail.drinx.com.au
58.87.2.28	PTR	exchange.davhosted.com.au
58.87.2.28	A	exchange.davhosted.com
58.87.2.28	A	mail.davhosted.com.au
58.87.2.29	A	exchange.davhosted.com.au
58.87.2.84	A	knowsoftware.com.au
58.87.2.130	PTR	pip559fw.iseek.com.au
58.87.2.130	A	windemere.com.au
58.87.2.131	A	avalonpropertygroup.com.au
58.87.2.138	A+PTR	mail.svmi.com.au
58.87.2.162	A	edmsl.com.au
58.87.2.162	A	mail.edmsl.com.au
58.87.2.162	A	gos1.edmsl.com.au
58.87.2.194	PTR	zimbra.davichi.com.au
58.87.2.194	A	allscope.net.au
58.87.2.196	A+PTR	zimbra.davichi.com.au
58.87.2.197	PTR	mail.barrierscreens.com.au
58.87.2.197	A	irideshare.com.au
58.87.2.197	A	davichi.co.uk
58.87.3.26	PTR	mail.assureprograms.com.au
58.87.3.50	A	bestlocalsearch.com.au
58.87.3.86	A	external.bridgepoint.com.au
58.87.3.114	PTR	firewalll.cslsanz.com.au
58.87.3.114	A	mail.cslsanz.com.au
58.87.3.134	A	mail.ptiaustralasia.com
58.87.3.222	A+PTR	mail.cead.com