Robtex

Up: 211.81.0.0/16
Can't show all results, try to descend to a more specific CIDR
Down left: 211.81.128.0/18
Down right: 211.81.192.0/18
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
211.81.153.195	PTR	mail.xttc.edu.cn.153.81.211.in-addr.arpa
211.81.153.195	A	mail.xttc.edu.cn
211.81.153.197	A+PTR	dns-server-2.xttc.edu.cn
211.81.153.197	A	application-server.xttc.edu.cn
211.81.153.200	PTR	dns-server-1.xttc.edu.cn
211.81.153.200	A	dns-server.xttc.edu.cn
211.81.162.1	A+PTR	zsjy.ncist.edu.cn
211.81.162.1	PTR	zsjyzdzx.ncist.edu.cn
211.81.166.94	A	xhszsty.com
211.81.174.11	A	edueb.com
211.81.175.5	A	dns.ncist.edu.cn
211.81.175.22	A	jpkc2.ncist.edu.cn
211.81.176.11	A+PTR	dns.hepec.edu.cn
211.81.176.18	PTR	bgs.hepec.edu.cn
211.81.176.18	PTR	dtl.hepec.edu.cn
211.81.176.18	PTR	gh.hepec.edu.cn
211.81.200.5	PTR	ns.tstc.edu.cn
211.81.200.5	A	dns1.tstc.edu.cn
211.81.200.6	A	dns2.tstc.edu.cn
211.81.208.2	A	dnsserver.hebeinu.edu.cn
211.81.208.4	A	xdoio.com
211.81.208.12	A	dnsserverbak.hebeinu.edu.cn
211.81.208.71	A	mail.hebeinu.edu.cn
211.81.213.200	A	www.hbun.edu.cn
211.81.224.1	A	ns1.cdmc.edu.cn
211.81.224.2	A	ns2.cdmc.edu.cn
211.81.224.5	A	mail.cdmc.edu.cn
211.81.241.6	A	90.ysu.edu.cn
211.81.241.167	A	kjc.ysu.edu.cn
211.81.244.134	A	xueriyu.com
211.81.244.180	A	*.51sunny.com
211.81.249.111	A	stc.ysu.edu.cn
211.81.249.118	A	liren54.com
211.81.251.14	A	yantutech.com