Robtex

Up: 203.153.192.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 203.153.192.0/23
Down right: 203.153.194.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.153.192.30	PTR	hosting3.mytelecom.net.au
203.153.192.30	A	slaneys.com
203.153.192.30	A	myinbox.net.au
203.153.192.251	PTR	mail.isrgs.com.au
203.153.192.251	A	iautostore.com.au
203.153.192.251	A	iautoparts.com.au
203.153.194.11	PTR	mera-ts.melb.core.mytelecom.net.au