Robtex

Up: 202.75.80.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 202.75.81.0/25
Down right: 202.75.81.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
202.75.81.130	PTR	rms.vtc.edu.hk
202.75.81.130	PTR	webmail.vtc.edu.hk
202.75.81.131	PTR	webmail.stu.vtc.edu.hk
202.75.81.200	A+PTR	dns1.vtc.edu.hk
202.75.81.200	PTR	mdchk.net
202.75.81.200	PTR	mdchk.com
202.75.81.201	A	merlot.vtc.edu.hk
202.75.81.250	PTR	dns2.vtc.edu.hk