Robtex

Up: 203.15.64.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 203.15.64.0/25
Down right: 203.15.64.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.15.64.1	A+PTR	gw.resmed.com.au
203.15.64.7	A+PTR	au3r99b.resmed.com.au
203.15.64.7	PTR	bgp2.resmed.com.au
203.15.64.9	PTR	resmed.at
203.15.64.9	PTR	healthysleep.com
203.15.64.9	PTR	mirageswift.com
203.15.64.10	PTR	mx.resmed.com.au
203.15.64.10	A+PTR	smtp-inbound.resmed.com.au
203.15.64.10	A	costelloex7.resmed.com.au
203.15.64.11	A+PTR	documents.resmed.com
203.15.64.12	PTR	aktivesschlafen.ch
203.15.64.12	PTR	resmed.de
203.15.64.12	PTR	resmed.com.cn
203.15.64.14	A+PTR	originconnect.resmed.com
203.15.64.14	PTR	owa.resmed.com.au
203.15.64.15	A	costelloex2.resmed.com.au
203.15.64.28	A	rdctest.resmed.com.au
203.15.64.29	A	search.resmed.com
203.15.64.31	A	ex.support.resmed.com
203.15.64.40	A	mungo.resmed.com.au
203.15.64.46	A+PTR	sslvpn.resmed.com.au
203.15.64.50	A	test.resmed.org
203.15.64.50	A	au3isa02ex2.resmed.com.au
203.15.64.53	A	sydneyrdcuat.resmed.com.au
203.15.64.61	A	webp.sleepvantage.com.au
203.15.64.66	A	sydneyrdcdev.resmed.com.au
203.15.64.68	A	nptest.resmed.com.au
203.15.64.132	A	au3isa02ex1.resmed.com.au
203.15.64.133	A	dev-www-origin.resmed.com
203.15.64.134	A+PTR	dev-nocache-origin.resmed.com
203.15.64.141	A	support.resmed.com.au
203.15.64.141	A	support.resmed.com
203.15.64.156	A+PTR	au3tmg04ex1.resmed.com.au
203.15.64.157	A+PTR	au3tmg04ex2.resmed.com.au
203.15.64.157	PTR	mx.resmed.com.au
203.15.64.244	A	au3isa02vpn.resmed.com.au
203.15.64.247	A	fabioex.resmed.com.au
203.15.64.252	A+PTR	cosmoex.resmed.com.au