Robtex

Up: 123.243.8.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 123.243.12.0/23
Down right: 123.243.14.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.243.12.15	A	123-243-12-15.static.tpgi.com.au
123.243.12.56	PTR	mail.crhodes.com.au
123.243.12.56	A	crhodes.com.au
123.243.12.101	PTR	123-243-12-101.static.tpgi.com.au
123.243.12.101	A	digitalplus.com.au
123.243.12.101	A	mail.digitalplus.com.au
123.243.12.116	A	taxii.com.au
123.243.12.226	A	mail.webo.com.au
123.243.13.12	PTR	mail.insightprojects.com.au
123.243.13.14	A+PTR	123-243-13-14.static.tpgi.com.au
123.243.13.15	PTR	mobile.enosys.com.au
123.243.13.26	A+PTR	123-243-13-26.static.tpgi.com.au
123.243.13.33	A+PTR	123-243-13-33.static.tpgi.com.au
123.243.13.84	A	mail.noallco.com.au
123.243.13.100	A	remote.chinatex.com.au
123.243.13.103	A+PTR	123-243-13-103.static.tpgi.com.au
123.243.13.104	A	mail.mediaestablishment.com
123.243.13.110	A+PTR	123-243-13-110.static.tpgi.com.au
123.243.13.123	PTR	123-243-13-123.static.tpgi.com.au
123.243.13.123	A	smtp5.borok.de
123.243.13.123	A	smtp2.irinas-world.de
123.243.13.131	A+PTR	123-243-13-131.static.tpgi.com.au
123.243.13.131	A	lori-cam.com
123.243.13.135	PTR	mail.frenchtravel.com.au
123.243.13.135	A	mail2.frenchtravel.com.au
123.243.13.178	A+PTR	123-243-13-178.static.tpgi.com.au
123.243.13.187	PTR	123-243-13-187.static.tpgi.com.au
123.243.13.196	A	mail.kikkoman.com.au
123.243.13.228	A+PTR	123-243-13-228.static.tpgi.com.au
123.243.13.235	PTR	123-243-13-235.static.tpgi.com.au
123.243.13.235	A	nineworlds.com.au
123.243.14.5	A	123-243-14-5.tpgi.com.au
123.243.14.9	A	123-243-14-9.tpgi.com.au
123.243.14.11	A	123-243-14-11.tpgi.com.au
123.243.14.12	A	123-243-14-12.tpgi.com.au
123.243.14.15	A	123-243-14-15.tpgi.com.au
123.243.14.16	A	123-243-14-16.tpgi.com.au
123.243.14.17	A	123-243-14-17.tpgi.com.au
123.243.14.19	A	123-243-14-19.tpgi.com.au
123.243.14.21	PTR	sadikhov.net
123.243.14.21	A	www.sadikhov.com
123.243.14.21	A	ns1.sadikhov.net
123.243.14.26	A	123-243-14-26.tpgi.com.au
123.243.14.27	A	123-243-14-27.tpgi.com.au
123.243.14.28	A	123-243-14-28.tpgi.com.au
123.243.14.29	A	123-243-14-29.tpgi.com.au
123.243.14.30	A	123-243-14-30.tpgi.com.au
123.243.14.32	A	123-243-14-32.tpgi.com.au
123.243.14.33	A	123-243-14-33.tpgi.com.au
123.243.14.34	A	123-243-14-34.tpgi.com.au
123.243.14.37	A	123-243-14-37.tpgi.com.au
123.243.14.38	A	123-243-14-38.tpgi.com.au
123.243.14.40	A	123-243-14-40.tpgi.com.au
123.243.14.42	A	123-243-14-42.tpgi.com.au
123.243.14.44	A	123-243-14-44.tpgi.com.au
123.243.14.45	A	123-243-14-45.tpgi.com.au
123.243.14.46	A	123-243-14-46.tpgi.com.au
123.243.14.47	A	123-243-14-47.tpgi.com.au
123.243.14.49	A	123-243-14-49.tpgi.com.au
123.243.14.50	A	123-243-14-50.tpgi.com.au
123.243.14.53	A	123-243-14-53.tpgi.com.au
123.243.14.55	A	123-243-14-55.tpgi.com.au
123.243.14.58	A	123-243-14-58.tpgi.com.au
123.243.14.61	A	123-243-14-61.tpgi.com.au
123.243.14.64	A	123-243-14-64.tpgi.com.au
123.243.14.65	A	123-243-14-65.tpgi.com.au
123.243.14.66	A	123-243-14-66.tpgi.com.au
123.243.14.68	A	123-243-14-68.tpgi.com.au
123.243.14.69	A	123-243-14-69.tpgi.com.au
123.243.14.70	A	123-243-14-70.tpgi.com.au
123.243.14.74	A	123-243-14-74.tpgi.com.au
123.243.14.75	A	123-243-14-75.tpgi.com.au
123.243.14.77	A	123-243-14-77.tpgi.com.au
123.243.14.78	A	123-243-14-78.tpgi.com.au
123.243.14.80	A	123-243-14-80.tpgi.com.au
123.243.14.81	A	123-243-14-81.tpgi.com.au
123.243.14.87	A	123-243-14-87.tpgi.com.au
123.243.14.89	A	123-243-14-89.tpgi.com.au
123.243.14.103	A	123-243-14-103.tpgi.com.au
123.243.14.112	A	123-243-14-112.tpgi.com.au
123.243.14.119	A	123-243-14-119.tpgi.com.au
123.243.14.125	A	123-243-14-125.tpgi.com.au
123.243.14.130	A	123-243-14-130.tpgi.com.au
123.243.14.133	A	123-243-14-133.tpgi.com.au
123.243.14.138	A+PTR	123-243-14-138.static.tpgi.com.au
123.243.14.138	A	123-243-14-138.tpgi.com.au
123.243.14.139	A	123-243-14-139.tpgi.com.au
123.243.14.143	A	123-243-14-143.tpgi.com.au
123.243.14.146	A	123-243-14-146.tpgi.com.au
123.243.14.148	A	123-243-14-148.tpgi.com.au
123.243.14.157	A	123-243-14-157.tpgi.com.au
123.243.14.166	A	123-243-14-166.tpgi.com.au
123.243.14.173	A	123-243-14-173.tpgi.com.au
123.243.14.177	A	123-243-14-177.tpgi.com.au
123.243.14.184	A	123-243-14-184.tpgi.com.au
123.243.14.186	A	123-243-14-186.tpgi.com.au
123.243.14.188	A	123-243-14-188.tpgi.com.au
123.243.14.189	A	123-243-14-189.tpgi.com.au
123.243.14.202	A	123-243-14-202.tpgi.com.au
123.243.14.211	A	123-243-14-211.tpgi.com.au
123.243.14.212	A+PTR	123-243-14-212.static.tpgi.com.au
123.243.14.212	A	123-243-14-212.tpgi.com.au
123.243.14.213	A	123-243-14-213.tpgi.com.au
123.243.14.215	A	123-243-14-215.tpgi.com.au
123.243.14.218	A	123-243-14-218.tpgi.com.au
123.243.14.221	A	123-243-14-221.tpgi.com.au
123.243.14.223	A	123-243-14-223.tpgi.com.au
123.243.14.224	A	123-243-14-224.tpgi.com.au
123.243.14.225	A	123-243-14-225.tpgi.com.au
123.243.14.229	A	123-243-14-229.tpgi.com.au
123.243.14.233	A	123-243-14-233.tpgi.com.au
123.243.14.243	A	123-243-14-243.tpgi.com.au
123.243.14.251	A	123-243-14-251.tpgi.com.au
123.243.15.2	A	123-243-15-2.static.tpgi.com.au
123.243.15.140	A+PTR	123-243-15-140.static.tpgi.com.au
123.243.15.176	PTR	123-243-15-176.static.tpgi.com.au