Robtex

Up: 143.89.20.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 143.89.22.0/24
Down right: 143.89.23.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
143.89.22.166	A+PTR	cez042.ce.ust.hk
143.89.22.166	A	akirakan.com
143.89.23.113	A+PTR	cez257.ce.ust.hk
143.89.23.113	A	mail.iasdm.org
143.89.23.113	A	www.iasdm.org
143.89.23.210	A	cez171.ce.ust.hk
143.89.23.253	A+PTR	dns.ce.ust.hk