Robtex

Up: 123.243.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 123.243.20.0/23
Down right: 123.243.22.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.243.20.34	PTR	123-243-20-34.static.tpgi.com.au
123.243.20.34	A	hoerzer.org
123.243.20.34	A	mail.hoerzer.org
123.243.20.42	A	zingfactor.com.au
123.243.20.178	PTR	mail.orioncruises.com.au
123.243.20.218	A	ns2.110.com.au
123.243.21.25	PTR	123-243-21-25.static.tpgi.com.au
123.243.21.26	A	mail.madikonda.com
123.243.21.26	A	mail.sri.com.au
123.243.21.45	PTR	123-243-21-45.static.tpgi.com.au
123.243.21.45	A	crctech.net.au
123.243.21.57	A+PTR	123-243-21-57.static.tpgi.com.au
123.243.21.89	A	123-243-21-89.static.tpgi.com.au
123.243.21.144	PTR	123-243-21-144.static.tpgi.com.au
123.243.21.148	A+PTR	123-243-21-148.static.tpgi.com.au
123.243.21.200	A	mail.bgunifiedsolutions.net
123.243.22.1	A	123-243-22-1.static.tpgi.com.au
123.243.22.90	PTR	123-243-22-90.static.tpgi.com.au
123.243.22.90	A	tomgrimshaw.com
123.243.22.90	A	mail.tomgrimshaw.com
123.243.22.149	PTR	123-243-22-149.static.tpgi.com.au
123.243.22.149	A	mail.raisedimage.com
123.243.22.159	PTR	123-243-22-159.static.tpgi.com.au
123.243.22.159	A	mail.latindance.com.au
123.243.22.225	PTR	mx1.cleardigital.com.au
123.243.23.1	PTR	123-243-23-1.static.tpgi.com.au
123.243.23.14	A	123-243-23-14.static.tpgi.com.au
123.243.23.15	A	123-243-23-15.static.tpgi.com.au
123.243.23.32	A	123-243-23-32.static.tpgi.com.au
123.243.23.100	A	123-243-23-100.static.tpgi.com.au
123.243.23.102	A	123-243-23-102.static.tpgi.com.au
123.243.23.108	A	123-243-23-108.static.tpgi.com.au
123.243.23.109	A	123-243-23-109.static.tpgi.com.au
123.243.23.110	A	123-243-23-110.static.tpgi.com.au
123.243.23.117	A	123-243-23-117.static.tpgi.com.au
123.243.23.122	A	mail.newclear.com.au
123.243.23.124	A	123-243-23-124.static.tpgi.com.au
123.243.23.127	A	123-243-23-127.static.tpgi.com.au
123.243.23.139	A	123-243-23-139.static.tpgi.com.au
123.243.23.140	A	123-243-23-140.static.tpgi.com.au
123.243.23.146	A	123-243-23-146.static.tpgi.com.au
123.243.23.149	A	123-243-23-149.static.tpgi.com.au
123.243.23.153	A	123-243-23-153.static.tpgi.com.au
123.243.23.157	A	123-243-23-157.static.tpgi.com.au
123.243.23.160	A	123-243-23-160.static.tpgi.com.au
123.243.23.172	A	123-243-23-172.static.tpgi.com.au
123.243.23.174	A	123-243-23-174.static.tpgi.com.au
123.243.23.177	A	123-243-23-177.static.tpgi.com.au
123.243.23.178	PTR	123-243-23-178.static.tpgi.com.au
123.243.23.180	A	123-243-23-180.static.tpgi.com.au
123.243.23.181	A	123-243-23-181.static.tpgi.com.au
123.243.23.185	A	123-243-23-185.static.tpgi.com.au
123.243.23.186	A	123-243-23-186.static.tpgi.com.au
123.243.23.197	A	123-243-23-197.static.tpgi.com.au
123.243.23.199	A	123-243-23-199.static.tpgi.com.au
123.243.23.202	A	123-243-23-202.static.tpgi.com.au
123.243.23.204	A	123-243-23-204.static.tpgi.com.au
123.243.23.208	A	123-243-23-208.static.tpgi.com.au
123.243.23.210	A	123-243-23-210.static.tpgi.com.au
123.243.23.211	A	123-243-23-211.static.tpgi.com.au
123.243.23.212	A	123-243-23-212.static.tpgi.com.au
123.243.23.213	A	123-243-23-213.static.tpgi.com.au
123.243.23.214	A	123-243-23-214.static.tpgi.com.au