Robtex

Up: 123.243.22.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 123.243.22.0/25
Down right: 123.243.22.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
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