Robtex

Up: 203.83.0.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 203.83.4.0/23
Down right: 203.83.6.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.83.4.1	PTR	203.83.4.1.speedweb.com.au
203.83.4.2	PTR	203.83.4.2.speedweb.com.au
203.83.4.4	PTR	mail.speedweb.com.au
203.83.4.4	A	gwsv.com.au
203.83.4.4	A	lvsn.com.au
203.83.4.6	PTR	win32-apps.speedweb.com.au
203.83.4.7	PTR	203.83.4.7.speedweb.com.au
203.83.4.8	A+PTR	av.speedweb.com.au
203.83.4.9	PTR	mail.eartrak.com
203.83.4.9	A+PTR	joomla.speedweb.com.au
203.83.4.9	A	fisherspallets.com.au
203.83.4.14	PTR	cust-web.speedweb.com.au
203.83.4.14	A	rawson.vic.au
203.83.4.14	A	redfoxframes.com.au
203.83.4.16	A	airxcluder.com
203.83.4.18	A+PTR	dns2.speedweb.com.au
203.83.4.18	A	ns2.speedweb.com.au
203.83.4.20	PTR	hosted.hm.ramahyuck.org
203.83.4.20	A	hosted.hm.nindedana.net
203.83.4.20	A	nindedana.net
203.83.4.21	PTR	203.83.4.21.speedweb.com.au
203.83.4.21	A	trustweld.com.au
203.83.4.26	A+PTR	cpan.speedweb.com.au
203.83.4.26	A	trustweld.com.au
203.83.4.26	A	www.morwellgolfclub.com.au
203.83.4.30	PTR	av17.speedweb.com.au
203.83.4.41	A	dns-1.speedweb.com.au
203.83.4.42	A	dns-2.speedweb.com.au
203.83.4.45	A	latrobevet.com.au
203.83.4.52	A	mail.kwproperty.com.au
203.83.4.89	PTR	203.83.4.89.speedweb.com.au
203.83.4.96	PTR	203.83.4.96.speedweb.com.au
203.83.4.109	PTR	203.83.4.109.speedweb.com.au
203.83.4.111	PTR	203.83.4.111.speedweb.com.au
203.83.5.1	PTR	203.83.5.1.speedweb.com.au
203.83.5.22	PTR	203.83.5.22.speedweb.com.au
203.83.5.35	PTR	203.83.5.35.speedweb.com.au
203.83.5.51	PTR	203.83.5.51.speedweb.com.au
203.83.5.86	PTR	203.83.5.86.speedweb.com.au
203.83.5.100	A	mail.keithwilliams.com.au
203.83.5.244	PTR	203.83.5.244.speedweb.com.au
203.83.6.1	PTR	203.83.6.1.speedweb.com.au
203.83.6.2	PTR	203.83.6.2.speedweb.com.au
203.83.6.13	PTR	203.83.6.13.speedweb.com.au
203.83.6.13	A	cpan.speedweb.com.au
203.83.7.76	A+PTR	rvserver.rawsonvillage.com
203.83.7.76	A	mail.rawsonvillage.com