Robtex

Up: 58.221.78.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 58.221.79.0/25
Down right: 58.221.79.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
58.221.79.15	A	mail.likuo.com
58.221.79.15	A	mail.chenzhong.com.cn
58.221.79.15	A	m.zmail300.cn
58.221.79.18	A	mxn3.global-mail.cn
58.221.79.30	A+PTR	etcsmtp.zmail300.cn
58.221.79.32	A+PTR	etcsmtp.zmail300.cn
58.221.79.33	A+PTR	etcsmtp.zmail300.cn
58.221.79.33	A	mailv.zmail300.cn
58.221.79.33	A	webmail.zmail.net.cn
58.221.79.34	A+PTR	etcsmtp.zmail300.cn
58.221.79.34	A	mail.6464.cn
58.221.79.35	PTR	etcsmtp.zmail300.cn
58.221.79.35	A	pop.grt.bz
58.221.79.35	A	pop.tjszsteel.com
58.221.79.36	A+PTR	etcsmtp.zmail300.cn
58.221.79.37	A+PTR	etcsmtp.zmail300.cn
58.221.79.38	A+PTR	etcsmtp.zmail300.cn
58.221.79.39	A	etcsmtp.zmail300.cn
58.221.79.40	A+PTR	etcsmtp.zmail300.cn
58.221.79.41	A+PTR	etcsmtp.zmail300.cn
58.221.79.45	A	smtp.xinnetvip.com
58.221.79.45	A	smtp-n.global-mail.cn
58.221.79.45	A	smtp.qdmr.com
58.221.79.46	A	mail.chinamega.cc
58.221.79.46	A	mail.motorsf.com
58.221.79.46	A	mail.wuxitljl.com
58.221.79.47	A	mail.likuo.com
58.221.79.47	A	mail.humenfood.com
58.221.79.47	A	mail.zgchuanli.com
58.221.79.52	A+PTR	mx.zmail300.cn
58.221.79.52	A	zqbuy.cn
58.221.79.52	A	mx.cnyitai.com
58.221.79.53	PTR	mxnt-n.global-mail.cn
58.221.79.53	A	mx.xinnetdns.com
58.221.79.53	A	mx.czjybz.com
58.221.79.55	A	crowneplazashanghaipujiang.com
58.221.79.55	A	imapv.zmail300.cn
58.221.79.55	A	imap.zmail300.cn
58.221.79.58	A	pop.zmail300.cn
58.221.79.58	A	pop.zmail.net.cn
58.221.79.58	A	mail.dgcopynet.cn
58.221.79.59	A	smtp.twin-town.com.cn
58.221.79.59	A	smtp.hanmould.com
58.221.79.59	A	smtp.roofingtiles.cn
58.221.79.61	A	webmail.xinnetdns.com
58.221.79.61	A	admin.xinnetvip.com
58.221.79.61	A	webfreemail-g4.xinnetdns.com
58.221.79.73	A+PTR	free.global-mail.cn
58.221.79.74	A+PTR	free.global-mail.cn
58.221.79.75	A+PTR	free.global-mail.cn
58.221.79.76	A+PTR	free.global-mail.cn
58.221.79.77	A+PTR	free.global-mail.cn
58.221.79.78	A	free.global-mail.cn
58.221.79.79	A	free.global-mail.cn
58.221.79.80	A+PTR	free.global-mail.cn
58.221.79.81	A+PTR	free.global-mail.cn
58.221.79.82	A+PTR	free.global-mail.cn
58.221.79.83	A+PTR	etcsmtp.zmail300.cn
58.221.79.84	A+PTR	etcsmtp.zmail300.cn
58.221.79.85	A+PTR	etcsmtp.zmail300.cn
58.221.79.86	A+PTR	etcsmtp.zmail300.cn
58.221.79.87	A+PTR	etcsmtp.zmail300.cn
58.221.79.88	A+PTR	etcsmtp.zmail300.cn
58.221.79.89	A+PTR	etcsmtp.zmail300.cn
58.221.79.90	A+PTR	etcsmtp.zmail300.cn
58.221.79.91	A+PTR	etcsmtp.zmail300.cn
58.221.79.92	A+PTR	etcsmtp.zmail300.cn
58.221.79.93	A	help.global-mail.cn
58.221.79.93	A	mx4-n.global-mail.cn
58.221.79.93	A	mx.mailset.cn
58.221.79.101	A	mail.sxy.top
58.221.79.110	A	imap-n.global-mail.cn
58.221.79.120	A	mail.confhr.com
58.221.79.120	A	mail.hllcec.com
58.221.79.120	A	mail.luzbao.com
58.221.79.126	A	mail.yidaba.net
58.221.79.126	A	smtp300.zmail300.cn
58.221.79.134	A+PTR	etcsmtp1.zmail300.cn
58.221.79.135	A+PTR	etcsmtp1.zmail300.cn
58.221.79.136	A+PTR	etcsmtp1.zmail300.cn
58.221.79.137	A+PTR	etcsmtp1.zmail300.cn
58.221.79.138	A+PTR	etcsmtp1.zmail300.cn
58.221.79.139	A+PTR	etcsmtp1.zmail300.cn
58.221.79.140	A+PTR	etcsmtp1.zmail300.cn
58.221.79.140	A	mx6-n.global-mail.cn
58.221.79.140	A	mx4.zmail300.cn
58.221.79.141	A+PTR	etcsmtp1.zmail300.cn
58.221.79.221	PTR	mx-n.global-mail.cn
58.221.79.221	A	mx.xinnetdns.com
58.221.79.221	A	cello.global-mail.cn
58.221.79.222	A	mx-t.global-mail.cn
58.221.79.225	PTR	mxv.zmail300.cn
58.221.79.225	A	mx.zmail300.cn
58.221.79.225	A	mx.zmail.net.cn
58.221.79.233	A	smtp.xinnetvip.com
58.221.79.233	A	smtp.xinnetdns.com
58.221.79.250	A	smtp.zmail.net.cn