Robtex

Up: 137.189.168.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 137.189.168.0/23
Down right: 137.189.170.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
137.189.168.64	A+PTR	pc168064.cco.cuhk.edu.hk
137.189.168.99	A+PTR	pc168099.cco.cuhk.edu.hk
137.189.168.103	A+PTR	pc168103.cco.cuhk.edu.hk
137.189.168.104	A+PTR	pc168104.cco.cuhk.edu.hk
137.189.168.140	A+PTR	pc168140.cco.cuhk.edu.hk
137.189.168.151	A+PTR	pc168151.cco.cuhk.edu.hk
137.189.168.178	A+PTR	pc168178.cco.cuhk.edu.hk
137.189.168.185	A+PTR	pc168185.cco.cuhk.edu.hk
137.189.168.196	A+PTR	pc168196.cco.cuhk.edu.hk
137.189.169.92	A+PTR	iofc.grm.cuhk.edu.hk
137.189.169.104	PTR	sea.grm.chuk.edu.hk
137.189.169.104	A	sea.grm.cuhk.edu.hk
137.189.169.105	A+PTR	mail01.grm.cuhk.edu.hk
137.189.169.105	A	ns01.grm.cuhk.edu.hk
137.189.169.105	A	mail.grm.cuhk.edu.hk
137.189.169.107	PTR	spider.grm.cuhk.edu.hk
137.189.169.107	A	grm.cuhk.edu.hk
137.189.169.108	PTR	e220r.grm.cuhk.edu.hk
137.189.169.108	A	grm.cuhk.edu.hk
137.189.169.108	A	ns03.grm.cuhk.edu.hk
137.189.170.3	A+PTR	bpsucl.lib.cuhk.edu.hk
137.189.170.3	A	dnsucl.lib.cuhk.edu.hk
137.189.170.67	A	login.easyaccess2.lib.cuhk.edu.hk
137.189.170.67	A	easyaccess2.lib.cuhk.edu.hk
137.189.170.237	A+PTR	diva.lib.cuhk.edu.hk
137.189.171.88	A+PTR	udi.lib.cuhk.edu.hk
137.189.171.235	PTR	green.lib.cuhk.edu.hk
137.189.171.235	A	wes.sagepub.com.easyaccess1.lib.cuhk.edu.hk
137.189.171.235	A	easyaccess1.lib.cuhk.edu.hk
137.189.171.236	A+PTR	hkinchip.lib.cuhk.edu.hk
137.189.171.236	A	www.hkcan.net
137.189.171.236	A	hkcan.net