Robtex

Up: 203.57.22.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 203.57.23.0/25
Down right: 203.57.23.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.57.23.9	A	logs.iig.com.au
203.57.23.46	A+PTR	mta-i.mail.iig.com.au
203.57.23.47	A+PTR	mta-h.mail.iig.com.au
203.57.23.51	A+PTR	out-d.mail.iig.com.au
203.57.23.52	A+PTR	out-c.mail.iig.com.au
203.57.23.53	A+PTR	out-b.mail.iig.com.au
203.57.23.54	A+PTR	out-a.mail.iig.com.au
203.57.23.56	PTR	mta-a.mail.iig.com.au
203.57.23.58	A	mta-c.mail.iig.com.au
203.57.23.59	A	mta.mail.iig.com.au
203.57.23.59	A	mta-d.mail.iig.com.au
203.57.23.60	A	mta.mail.iig.com.au
203.57.23.60	A	mx-a.mail.iig.com.au
203.57.23.61	A+PTR	ha1.mail.iig.com.au
203.57.23.61	A	mx-a.mail.iig.com.au
203.57.23.62	A+PTR	ha2.mail.iig.com.au
203.57.23.65	PTR	firewall-002.net.iig.com.au
203.57.23.66	A+PTR	ws23066.iig.com.au
203.57.23.66	A	tablelands.net.au
203.57.23.67	PTR	ws23067.iig.com.au
203.57.23.67	A	accomcairnsproperty.com.au
203.57.23.67	A	www.studioproductions.com.au
203.57.23.68	A+PTR	webmail.iig.com.au
203.57.23.69	A+PTR	ws23069.iig.com.au
203.57.23.70	A+PTR	voice-bill.iig.com.au
203.57.23.129	PTR	bne-8-fe1.net.iig.com.au
203.57.23.130	PTR	mail.qgs.net.au
203.57.23.131	A+PTR	pbx.nghols.com
203.57.23.132	PTR	mail.inspectrealestate.com.au
203.57.23.132	A	inspectrealestate.com.au
203.57.23.132	A	inspectrealestate.co.nz
203.57.23.135	A+PTR	mail.maltby.id.au
203.57.23.136	A+PTR	files.maltby.id.au