Robtex

Up: 203.31.76.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 203.31.77.0/25
Down right: 203.31.77.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.31.77.1	A	ns1.crmaus.com.au
203.31.77.2	A	ns2.crmaus.com.au
203.31.77.70	A	mx.konstanlawyers.com.au
203.31.77.71	PTR	mail.akcs.com.au
203.31.77.71	A	mx.nace.com.au
203.31.77.71	A	mail.estoria.com.au