Robtex

Up: 203.129.56.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 203.129.56.0/23
Down right: 203.129.58.0/23

IP	Type	Hostname
203.129.56.228	A	reserved-56-228.grapevine.net.au
203.129.57.1	PTR	reserved-57-1.grapevine.net.au
203.129.57.1	A	paxcigam.com
203.129.58.36	A	reserved-58-36.grapevine.net.au
203.129.58.153	A	reserved-58-153.grapevine.net.au
203.129.59.100	A	reserved-59-100.grapevine.net.au
203.129.59.253	A+PTR	reserved-59-253.grapevine.net.au