Robtex

Up: 123.243.184.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 123.243.188.0/23
Down right: 123.243.190.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.243.188.21	A+PTR	123-243-188-21.static.tpgi.com.au
123.243.188.33	A+PTR	123-243-188-33.static.tpgi.com.au
123.243.188.42	A+PTR	123-243-188-42.static.tpgi.com.au
123.243.188.51	A+PTR	123-243-188-51.static.tpgi.com.au
123.243.188.75	A+PTR	123-243-188-75.static.tpgi.com.au
123.243.188.84	A+PTR	123-243-188-84.static.tpgi.com.au
123.243.188.119	A+PTR	123-243-188-119.static.tpgi.com.au
123.243.188.120	A+PTR	123-243-188-120.static.tpgi.com.au
123.243.188.126	A+PTR	123-243-188-126.static.tpgi.com.au
123.243.188.138	A+PTR	123-243-188-138.static.tpgi.com.au
123.243.188.159	A+PTR	123-243-188-159.static.tpgi.com.au
123.243.188.168	PTR	123-243-188-168.static.tpgi.com.au
123.243.188.189	A+PTR	123-243-188-189.static.tpgi.com.au
123.243.188.193	A+PTR	123-243-188-193.static.tpgi.com.au
123.243.188.194	A+PTR	123-243-188-194.static.tpgi.com.au
123.243.188.195	A+PTR	123-243-188-195.static.tpgi.com.au
123.243.188.201	A+PTR	123-243-188-201.static.tpgi.com.au
123.243.188.216	A+PTR	123-243-188-216.static.tpgi.com.au
123.243.188.217	A+PTR	123-243-188-217.static.tpgi.com.au
123.243.188.249	A+PTR	123-243-188-249.static.tpgi.com.au
123.243.189.126	A	mail.rigidsteel.com.au
123.243.189.254	PTR	123-243-189-254.static.tpgi.com.au
123.243.190.2	A+PTR	123-243-190-2.static.tpgi.com.au
123.243.190.3	PTR	123-243-190-3.static.tpgi.com.au
123.243.190.11	A+PTR	123-243-190-11.static.tpgi.com.au
123.243.190.17	A+PTR	123-243-190-17.static.tpgi.com.au
123.243.190.17	A	dc-6b9b0ffdc45b.syscomtechnologies.com.au
123.243.190.17	A	syscom.net.au
123.243.190.26	A+PTR	123-243-190-26.static.tpgi.com.au
123.243.190.29	A+PTR	123-243-190-29.static.tpgi.com.au
123.243.190.37	A+PTR	123-243-190-37.static.tpgi.com.au
123.243.190.43	A+PTR	123-243-190-43.static.tpgi.com.au
123.243.190.49	A+PTR	123-243-190-49.static.tpgi.com.au
123.243.190.53	A+PTR	123-243-190-53.static.tpgi.com.au
123.243.190.58	PTR	123-243-190-58.static.tpgi.com.au
123.243.190.60	A+PTR	123-243-190-60.static.tpgi.com.au
123.243.190.63	A+PTR	123-243-190-63.static.tpgi.com.au
123.243.190.69	A+PTR	123-243-190-69.static.tpgi.com.au
123.243.190.72	A+PTR	123-243-190-72.static.tpgi.com.au
123.243.190.73	A+PTR	123-243-190-73.static.tpgi.com.au
123.243.190.84	A+PTR	123-243-190-84.static.tpgi.com.au
123.243.190.89	A+PTR	123-243-190-89.static.tpgi.com.au
123.243.190.91	A+PTR	123-243-190-91.static.tpgi.com.au
123.243.190.93	A+PTR	123-243-190-93.static.tpgi.com.au
123.243.190.95	A+PTR	123-243-190-95.static.tpgi.com.au
123.243.190.104	A+PTR	123-243-190-104.static.tpgi.com.au
123.243.190.106	A+PTR	123-243-190-106.static.tpgi.com.au
123.243.190.112	A+PTR	123-243-190-112.static.tpgi.com.au
123.243.190.118	A+PTR	123-243-190-118.static.tpgi.com.au
123.243.190.119	A+PTR	123-243-190-119.static.tpgi.com.au
123.243.190.135	A+PTR	123-243-190-135.static.tpgi.com.au
123.243.190.136	A+PTR	123-243-190-136.static.tpgi.com.au
123.243.190.140	A+PTR	123-243-190-140.static.tpgi.com.au
123.243.190.142	A+PTR	123-243-190-142.static.tpgi.com.au
123.243.190.143	A+PTR	123-243-190-143.static.tpgi.com.au
123.243.190.149	A+PTR	123-243-190-149.static.tpgi.com.au
123.243.190.153	A+PTR	123-243-190-153.static.tpgi.com.au
123.243.190.154	A+PTR	123-243-190-154.static.tpgi.com.au
123.243.190.162	A+PTR	123-243-190-162.static.tpgi.com.au
123.243.190.163	A+PTR	123-243-190-163.static.tpgi.com.au
123.243.190.170	A+PTR	123-243-190-170.static.tpgi.com.au
123.243.190.173	A+PTR	123-243-190-173.static.tpgi.com.au
123.243.190.186	A+PTR	123-243-190-186.static.tpgi.com.au
123.243.190.191	A+PTR	123-243-190-191.static.tpgi.com.au
123.243.190.205	A+PTR	123-243-190-205.static.tpgi.com.au
123.243.190.209	A+PTR	123-243-190-209.static.tpgi.com.au
123.243.190.212	A+PTR	123-243-190-212.static.tpgi.com.au
123.243.190.217	A+PTR	123-243-190-217.static.tpgi.com.au
123.243.190.218	A+PTR	123-243-190-218.static.tpgi.com.au
123.243.190.219	A+PTR	123-243-190-219.static.tpgi.com.au
123.243.190.231	A+PTR	123-243-190-231.static.tpgi.com.au
123.243.190.232	A+PTR	123-243-190-232.static.tpgi.com.au
123.243.190.238	A+PTR	123-243-190-238.static.tpgi.com.au
123.243.190.239	A+PTR	123-243-190-239.static.tpgi.com.au
123.243.190.244	A+PTR	123-243-190-244.static.tpgi.com.au
123.243.190.248	A+PTR	123-243-190-248.static.tpgi.com.au
123.243.190.251	A+PTR	123-243-190-251.static.tpgi.com.au
123.243.190.255	A+PTR	123-243-190-255.static.tpgi.com.au
123.243.191.15	A	mail.qorf.org.au
123.243.191.34	PTR	123-243-191-34.static.tpgi.com.au
123.243.191.34	A	mailbox.consonic.com
123.243.191.43	A	dilly-server.com
123.243.191.92	A	123-243-191-92.static.tpgi.com.au
123.243.191.116	PTR	luisaranguren.com
123.243.191.118	PTR	123-243-191-118.static.tpgi.com.au
123.243.191.129	A	davidcoxdental.safenetbox.biz
123.243.191.137	PTR	123-243-191-137.static.tpgi.com.au
123.243.191.160	A+PTR	mail.yesit.com.au
123.243.191.160	A	mail2.yesit.com.au
123.243.191.213	A+PTR	123-243-191-213.static.tpgi.com.au