Robtex

Up: 123.243.18.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 123.243.19.0/25
Down right: 123.243.19.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.243.19.20	A+PTR	123-243-19-20.static.tpgi.com.au
123.243.19.35	A	opensourceearthproject.com
123.243.19.35	A	5dprojectconsulting.com
123.243.19.53	A+PTR	123-243-19-53.static.tpgi.com.au
123.243.19.56	A+PTR	123-243-19-56.static.tpgi.com.au
123.243.19.57	A+PTR	123-243-19-57.static.tpgi.com.au
123.243.19.58	A	performancetechnologies.com
123.243.19.82	A+PTR	123-243-19-82.static.tpgi.com.au
123.243.19.85	A+PTR	123-243-19-85.static.tpgi.com.au
123.243.19.86	A+PTR	123-243-19-86.static.tpgi.com.au
123.243.19.95	A+PTR	123-243-19-95.static.tpgi.com.au
123.243.19.107	A+PTR	123-243-19-107.static.tpgi.com.au
123.243.19.110	A	bowser.it
123.243.19.133	A	home.kelvinism.com
123.243.19.149	A+PTR	123-243-19-149.static.tpgi.com.au
123.243.19.160	A+PTR	123-243-19-160.static.tpgi.com.au
123.243.19.161	A+PTR	123-243-19-161.static.tpgi.com.au
123.243.19.172	A+PTR	123-243-19-172.static.tpgi.com.au
123.243.19.180	A+PTR	123-243-19-180.static.tpgi.com.au
123.243.19.187	A+PTR	123-243-19-187.static.tpgi.com.au
123.243.19.194	A	mail.blisstechnology.com
123.243.19.194	A	blisstechnology.com
123.243.19.201	A+PTR	123-243-19-201.static.tpgi.com.au
123.243.19.207	A+PTR	123-243-19-207.static.tpgi.com.au
123.243.19.210	A	smtp.skydances.info
123.243.19.210	A	skydances.info
123.243.19.210	A	mail.skydances.info
123.243.19.215	PTR	123-243-19-215.static.tpgi.com.au
123.243.19.215	A	mail.orthonorth.com.au
123.243.19.218	A+PTR	123-243-19-218.static.tpgi.com.au
123.243.19.223	PTR	123-243-19-223.static.tpgi.com.au
123.243.19.223	A	vintage-radio.com.au
123.243.19.223	A	induced.net
123.243.19.227	A+PTR	123-243-19-227.static.tpgi.com.au
123.243.19.233	A+PTR	123-243-19-233.static.tpgi.com.au
123.243.19.234	A+PTR	123-243-19-234.static.tpgi.com.au
123.243.19.235	PTR	123-243-19-235.static.tpgi.com.au
123.243.19.235	A	balanceinfosystems.com
123.243.19.235	A	ns3.balinf.com
123.243.19.238	A+PTR	123-243-19-238.static.tpgi.com.au
123.243.19.239	A	xironix.com
123.243.19.247	PTR	mail.gtais.com.au
123.243.19.252	A	123-243-19-252.static.tpgi.com.au