Robtex

Up: 203.8.220.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 203.8.221.0/25
Down right: 203.8.221.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.8.221.12	PTR	mail.ausmail.com
203.8.221.13	PTR	unallocated.gpstern.com
203.8.221.37	PTR	037.template.netport.net.au
203.8.221.63	A+PTR	mail.ausmail.com
203.8.221.63	A	mail.gpstern.com.au
203.8.221.70	A+PTR	ns1.gpstern.com
203.8.221.79	A+PTR	mail.vk2zbb.com
203.8.221.79	A	mail.gpstern.com
203.8.221.79	A	mail.ausfone.net
203.8.221.146	PTR	146.template.netport.net.au