Robtex

Up: 220.233.20.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 220.233.21.0/25
Down right: 220.233.21.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
220.233.21.4	A+PTR	4.21.233.220.static.exetel.com.au
220.233.21.29	A+PTR	29.21.233.220.static.exetel.com.au
220.233.21.44	A	44.21.233.220.static.exetel.com.au
220.233.21.70	A+PTR	70.21.233.220.static.exetel.com.au
220.233.21.94	A+PTR	94.21.233.220.static.exetel.com.au
220.233.21.94	A	server8.tk
220.233.21.94	A	mail.malwood.com
220.233.21.120	PTR	120.21.233.220.static.exetel.com.au
220.233.21.120	A	mail.ch.org.au
220.233.21.120	A	chorgau.duckdns.org
220.233.21.124	A	isaunders.com.au
220.233.21.141	PTR	141.21.233.220.static.exetel.com.au
220.233.21.141	A	mails.aline-test.com
220.233.21.141	A	remote.aline-test.com
220.233.21.143	A+PTR	143.21.233.220.static.exetel.com.au
220.233.21.143	A	mail.landmarkrussell.com.au
220.233.21.161	A+PTR	161.21.233.220.static.exetel.com.au
220.233.21.162	A+PTR	162.21.233.220.static.exetel.com.au
220.233.21.163	PTR	163.21.233.220.static.exetel.com.au
220.233.21.180	PTR	180.21.233.220.static.exetel.com.au
220.233.21.180	A	mail2.pjl.net.au
220.233.21.198	A+PTR	198.21.233.220.static.exetel.com.au
220.233.21.223	A+PTR	223.21.233.220.static.exetel.com.au
220.233.21.250	A	mail.parkproperties.com.au
220.233.21.251	A	syd10.cog-sys.co