Robtex

Up: 220.240.40.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 220.240.40.0/23
Down right: 220.240.42.0/23

IP	Type	Hostname
220.240.40.128	A	mail.erc.org.au
220.240.40.178	PTR	220.240.40-178.tpgi.com.au
220.240.41.167	A	mail.trashgallery.com
220.240.42.190	PTR	190.42.240.220.dynamic.dsl.comindico.com.au
220.240.42.190	A	mail.ifishworld.com