Robtex

Up: 210.31.100.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 210.31.100.0/25
Down right: 210.31.100.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
210.31.100.5	A	cancit.cn
210.31.100.21	A+PTR	www1.tit.edu.cn
210.31.100.41	A	www2.tit.edu.cn
210.31.100.51	A+PTR	dag.tit.edu.cn
210.31.100.51	PTR	dwgk.tit.edu.cn
210.31.100.51	PTR	dzbgs.tit.edu.cn
210.31.100.98	PTR	mail.tit.edu.cn