Robtex

Up: 121.5.16.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 121.5.16.0/22
Down right: 121.5.20.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
121.5.20.58	A	isoft-linux.com
121.5.20.94	A	newmail.epailive.com
121.5.20.94	A	epai6.com
121.5.20.150	A	mail.fenlei168.com
121.5.20.150	A	zgckfw.com
121.5.20.150	A	mail.easysalesplanner.com
121.5.20.196	A	htdata.com.cn
121.5.21.105	A	nhnst.com
121.5.21.105	A	www.nhnst.com
121.5.21.155	A	binary-graphics.com.cn
121.5.21.181	A	xn--4oqv9egta972c.cn
121.5.21.181	A	kai-bo.com
121.5.21.181	A	cfb.cn
121.5.21.186	A	oborhc.com
121.5.21.210	A	mail.antako.com
121.5.21.212	A	mail.unitatel.com
121.5.21.213	A+PTR	mail.quickcomglobal.com
121.5.21.213	A	barclayspremierleaguetrophytour.net
121.5.21.215	PTR	mail.ittctel.com
121.5.21.216	A+PTR	mail.yabair.com
121.5.21.217	A+PTR	mail.espringtel.com
121.5.21.237	A+PTR	www.dltenda.com
121.5.21.237	A	dltenda.com
121.5.21.245	A	decg.com.cn
121.5.23.134	A	dhccdl.com
121.5.23.134	A	dhwbzf.com
121.5.23.135	A	limei0502.com
121.5.23.140	A	mail.mhitco.com
121.5.23.172	A	gigatec.com.cn
121.5.23.172	A	dlunt.com
121.5.23.182	A	hgddl.com
121.5.23.228	A	xinhis.net
121.5.23.231	A	mx.cn-erp.org
121.5.23.231	A	cn-erp.org
121.5.23.233	A	www.cn-erp.org