Robtex

Up: 203.57.72.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 203.57.76.0/23
Down right: 203.57.78.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.57.78.6	A+PTR	filter2.nsw.cynergic.net
203.57.78.7	PTR	cynwasrvweb01.cynergic.net
203.57.78.7	A	ciptel.com.au
203.57.78.7	A	normroberts.com.au
203.57.78.8	A+PTR	wwwmail.cynergic.net
203.57.78.9	PTR	blackhole.cynergic.net
203.57.78.9	A	focus-on.com.au
203.57.78.9	A	rammed-earth.com.au
203.57.78.12	PTR	mail.multiline.com.au
203.57.78.12	A	mail.optimise.net.au
203.57.78.12	A	mail.samigrations.com.au
203.57.78.16	PTR	cubs.cynergic.net
203.57.78.16	A	accsyssql.git.com.au
203.57.78.16	A	customer.git.com.au
203.57.78.19	PTR	lmail.cynergic.com.au
203.57.78.24	A+PTR	horde.cynergic.net
203.57.78.24	A	webmail.git.com.au
203.57.78.47	A+PTR	illumin.git.com.au
203.57.78.48	PTR	pbf.git.com.au
203.57.78.48	A	eagleeye.net.au
203.57.78.51	A+PTR	percival.git.com.au
203.57.78.52	A	travel.git.com.au
203.57.78.53	PTR	canonwa.git.com.au
203.57.78.56	PTR	bcs.git.net.au
203.57.78.65	A	verilink.cynergic.net
203.57.78.66	A	office.git.com.au
203.57.78.132	A	mail.mapel.com.au
203.57.78.139	PTR	mail.wildlifesafari.com.au
203.57.78.141	PTR	smtp.thl.com.au
203.57.78.144	PTR	saipem.cynergic.net
203.57.78.150	A	debbie.cynergic.net
203.57.78.154	PTR	mail.abwair.com.au
203.57.78.167	A	rowick.com.au
203.57.78.220	A	plus8.com.au
203.57.78.220	A	www.swiftmedia.com.au
203.57.78.220	A	fullmoonhotel.com.au
203.57.79.13	PTR	mail.aiconline.com.au
203.57.79.122	PTR	mail.sethsecurity.com.au.79.57.203.in-addr.arpa