Robtex

Up: 113.21.32.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 113.21.40.0/22
Down right: 113.21.44.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
113.21.40.0	PTR	0.40.21.113.isphone.com.au
113.21.40.0	A	cityofsydney.nsw.gov.au
113.21.40.95	A	mail.cityofsydney.nsw.gov.au
113.21.40.200	A	mail.mycoinsnow.com
113.21.40.200	A	cameronmckean.com
113.21.40.200	A	mrcrowdfunder.com
113.21.41.85	PTR	85.41.21.113.isphone.com.au
113.21.41.85	A	mail.pespk.com.au
113.21.41.192	PTR	113-21-41-192.au.viaip.com
113.21.41.192	A	mail.outdoorfabrications.com.au
113.21.41.192	A	autodiscover.outdoorfabrications.com.au
113.21.41.252	PTR	113-21-41-252.au.viaip.com
113.21.41.252	A	mail.candasurveyors.com.au
113.21.42.2	PTR	113-21-42-2.au.viaip.com
113.21.42.10	PTR	113-21-42-10.au.viaip.com
113.21.42.18	PTR	113-21-42-18.au.viaip.com
113.21.42.34	PTR	113-21-42-34.au.viaip.com
113.21.42.35	PTR	113-21-42-35.au.viaip.com
113.21.42.40	PTR	113-21-42-40.au.viaip.com
113.21.42.51	PTR	113-21-42-51.au.viaip.com
113.21.42.57	PTR	113-21-42-57.au.viaip.com
113.21.42.74	PTR	113-21-42-74.au.viaip.com
113.21.42.75	PTR	113-21-42-75.au.viaip.com
113.21.42.88	PTR	113-21-42-88.au.viaip.com
113.21.42.98	PTR	113-21-42-98.au.viaip.com
113.21.42.105	PTR	113-21-42-105.au.viaip.com
113.21.42.107	PTR	113-21-42-107.au.viaip.com
113.21.42.120	PTR	113-21-42-120.au.viaip.com
113.21.42.136	PTR	113-21-42-136.au.viaip.com
113.21.42.138	PTR	113-21-42-138.au.viaip.com
113.21.42.145	PTR	113-21-42-145.au.viaip.com
113.21.42.146	PTR	113-21-42-146.au.viaip.com
113.21.42.155	PTR	113-21-42-155.au.viaip.com
113.21.42.185	A	smartsalary.com
113.21.42.192	PTR	113-21-42-192.au.viaip.com
113.21.42.202	PTR	113-21-42-202.au.viaip.com
113.21.42.203	PTR	113-21-42-203.au.viaip.com
113.21.42.217	PTR	113-21-42-217.au.viaip.com
113.21.42.225	PTR	113-21-42-225.au.viaip.com
113.21.42.227	PTR	113-21-42-227.au.viaip.com
113.21.42.234	PTR	113-21-42-234.au.viaip.com
113.21.42.235	PTR	113-21-42-235.au.viaip.com
113.21.44.18	PTR	113-21-44-18.au.viaip.com
113.21.44.27	PTR	mail.idx.com.au
113.21.44.27	A	loudboxstudios.com
113.21.44.27	A	bmxsportsasia.com
113.21.44.28	PTR	113-21-44-28.au.viaip.com
113.21.44.210	PTR	remote.bfpractice.com
113.21.44.210	A	bfpractice.com
113.21.45.234	A	ns10.netgecko.com.au
113.21.46.176	PTR	176.46.21.113.isphone.com.au
113.21.46.176	A	mail.hubbacloud.com
113.21.46.176	A	timeexpresscourier.com
113.21.46.187	PTR	113-21-46-187.au.viaip.com
113.21.46.187	A	ns3.alphanameserver.com
113.21.47.10	PTR	113-21-47-10.au.viaip.com
113.21.47.10	A	webeomedia.com.au
113.21.47.10	A	purefinance.com.au
113.21.47.46	A	efaspam01.mcadsl.com
113.21.47.247	PTR	113-21-47-247.au.viaip.com
113.21.47.247	A	mail.buildingworkshop.com.au