Robtex

Up: 221.3.128.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 221.3.128.0/19
Down right: 221.3.160.0/19
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
221.3.128.0	PTR	sk.s5.ans1.ns148.ztomy.com
221.3.131.2	A	ns.yncuc.net
221.3.131.3	A	ns1.yncuc.net
221.3.131.29	A	www.yncuc.net
221.3.131.54	A	yncuc.net
221.3.131.90	A	mail.yxepb.gov.cn
221.3.131.90	A	mail.yncuc.net
221.3.131.90	A	yukuang.com
221.3.131.116	A	fxfast.com.cn
221.3.131.148	A	yncuc.cn
221.3.131.148	A	www.yncuc.cn
221.3.131.180	A	pop.kminnet.com
221.3.131.189	A	ns0.cashflowzman.biz
221.3.131.227	A	chinakidstv.com
221.3.132.82	A	map.cs-cn.net
221.3.132.123	A	*.yncts.com
221.3.132.150	A	kmzcx.net
221.3.133.155	A	www.kmajw.com
221.3.133.155	A	kmajw.com
221.3.133.215	A	lt0503.com
221.3.133.243	A	zaptail.com
221.3.134.108	A	you-idea.net
221.3.140.229	A	3168999.com
221.3.143.66	A	ns1.sangforwww.com.ynjtt.com
221.3.143.66	A	ynjtt.gov.cn
221.3.143.66	A	www.ynjtt.com
221.3.148.150	A	boss.96599.cn
221.3.149.10	A	yunda.org
221.3.153.68	A	smshpc001.cnc.ccgslb.net
221.3.159.126	A	e7fl.com
221.3.159.138	A	max-foto.ru
221.3.159.138	A	mail.cxgsl.com
221.3.166.29	A	smsxdn.com
221.3.166.72	A	sertcp-mb.xgd4444.com
221.3.166.75	A	mb39090.psttm.com.cdngtm.com
221.3.166.104	A	ynlcmz.com
221.3.166.172	A	www.puecc.com
221.3.166.203	A	pegdwl.com
221.3.166.212	A	ynhtfashang.com
221.3.166.212	A	peycnet.com
221.3.168.42	A	mail.bndtn.com
221.3.168.42	A	bndtn.com
221.3.168.43	A	mail.bndtn.com
221.3.168.43	A	bndtn.com
221.3.182.228	A	xn--chqq6f7f86fs1ojirmgvtmkg3rb92c.com
221.3.189.134	A	mail.rrcb.com