Robtex

Up: 123.243.98.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 123.243.98.0/25
Down right: 123.243.98.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.243.98.126	A+PTR	123-243-98-126.tpgi.com.au
123.243.98.132	A+PTR	123-243-98-132.tpgi.com.au
123.243.98.134	A+PTR	magister.com.au
123.243.98.134	A	magister.smartblackbox.net
123.243.98.134	A	mail.magister.com.au
123.243.98.136	PTR	mail.smoorenburg.com.au
123.243.98.207	A	mail.aid-it.com