Robtex

Up: 103.4.172.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 103.4.172.0/25
Down right: 103.4.172.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
103.4.172.0	PTR	103-4-172-0.belmont.webvault.com.au
103.4.172.4	PTR	103-4-172-4.malaga.webvault.com.au
103.4.172.57	PTR	103-4-172-57.malaga.webvault.com.au
103.4.172.69	A	brainy.networkbackup.com.au
103.4.172.80	A+PTR	ns2.webvault.com.au
103.4.172.80	A	ns2.spirithosting.com.au
103.4.172.80	A	ns2.simplifyingit.com.au
103.4.172.81	PTR	103-4-172-81.belmont.webvault.com.au
103.4.172.90	A+PTR	mail2.webvault.com.au
103.4.172.90	A	mail2.spirithosting.com.au
103.4.172.90	A	mail2.simplifyingit.com.au
103.4.172.94	PTR	103-4-172-94.malaga.webvault.com.au
103.4.172.98	A+PTR	jigsawdigital.com
103.4.172.102	PTR	103-4-172-102.malaga.webvault.com.au
103.4.172.112	PTR	103-4-172-112.malaga.webvault.com.au
103.4.172.118	PTR	103-4-172-118.malaga.webvault.com.au
103.4.172.131	PTR	103-4-172-131.malaga.webvault.com.au
103.4.172.135	PTR	103-4-172-135.malaga.webvault.com.au
103.4.172.156	A+PTR	mx2.mailsolutions.com.au
103.4.172.156	A	mx10.mailsolutions.com.au
103.4.172.156	A	mx0.mailsolutions.com.au
103.4.172.158	PTR	103-4-172-158.belmont.webvault.com.au
103.4.172.164	PTR	103-4-172-164.malaga.webvault.com.au
103.4.172.164	A	ductup.com.au
103.4.172.164	A	coolcontact.com.au
103.4.172.170	PTR	103-4-172-170.zeropointnetworks.com
103.4.172.171	PTR	103-4-172-171.zeropointnetworks.com
103.4.172.171	A	zeropointnetworks.com
103.4.172.173	PTR	103-4-172-173.belmont.webvault.com.au
103.4.172.173	A	hanapotts.com
103.4.172.188	PTR	103-4-172-188.malaga.webvault.com.au
103.4.172.198	A+PTR	gibralter.zeropointnetworks.com
103.4.172.204	PTR	103-4-172-204.malaga.webvault.com.au
103.4.172.217	PTR	103-4-172-217.malaga.webvault.com.au
103.4.172.227	PTR	103-4-172-227.malaga.webvault.com.au
103.4.172.238	PTR	103-4-172-238.malaga.webvault.com.au
103.4.172.254	PTR	103-4-172-254.belmont.webvault.com.au