Robtex

Up: 220.231.32.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 220.231.40.0/22
Down right: 220.231.44.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
220.231.40.197	PTR	mail.orientalexpo.net
220.231.41.66	A	mx.efchina.org
220.231.41.77	A	ns.ied.cn
220.231.41.78	PTR	mx.ied.cn
220.231.41.105	A	ids.csteelnews.com
220.231.41.107	A	www.uniflows.com
220.231.41.107	A	uniflows.com
220.231.41.107	A	mail.yxhtcg.com
220.231.41.112	A	www.csteelnews.com
220.231.41.113	A	mail.csteelnews.cn
220.231.41.113	A	mail.csteelnews.com
220.231.41.194	A	ns.chinatex.net
220.231.41.194	A	ns.chinatex.com
220.231.41.195	A	ns3.chinatex.com
220.231.41.197	PTR	mx1.chinatex.com
220.231.41.198	PTR	mail.chinatex.com
220.231.41.198	A	mx5.chinatex.net
220.231.41.199	PTR	mx2.chinatex.com
220.231.41.200	PTR	mx5.chinatex.com
220.231.41.200	A	mx1.chinatex.net
220.231.41.200	A	mx1.chinatex.com
220.231.41.221	A	www.chinatex.com
220.231.41.231	A	mail3.chinatex.com
220.231.41.231	A	mail3.chinatex.net
220.231.41.247	A	filter.chinatex.net
220.231.42.11	A+PTR	mail.asdc.com.cn
220.231.42.23	A	bmschina.net
220.231.43.3	A	xn--fiq15sr9nuy8b.com
220.231.43.3	A	www.sinoma.cn
220.231.43.4	PTR	mail.sinoma-ltd.cn
220.231.43.4	A+PTR	mail.sinoma.cn
220.231.43.4	A	mail.sinomatech.com
220.231.43.20	PTR	mail.sinoma.cn
220.231.43.20	A	sinoma-geea.cn
220.231.43.20	A	sinoma-zchb.cn
220.231.43.100	PTR	mx-0.efchina.org
220.231.43.106	PTR	mx-6.efchina.org
220.231.43.107	PTR	mx-7.efchina.org
220.231.43.244	A	celercoo.com
220.231.44.251	A+PTR	mail.careerintlinc.com
220.231.44.251	PTR	mail.careerrpo.com
220.231.44.251	A+PTR	mail.chinacareer.com
220.231.46.125	A	ns.nim.org.cn
220.231.47.162	A	lc1.jsfund.cn