Robtex

Up: 116.50.56.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 116.50.56.0/23
Down right: 116.50.58.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
116.50.56.1	PTR	116-50-56-1.mailcontrol.com
116.50.57.1	PTR	lo0.rtr01k.frcpt.net
116.50.57.19	PTR	gi0-0-758.rtr02k.mailcontrol.com
116.50.57.110	PTR	116-50-57-110.mailcontrol.com
116.50.57.139	PTR	116-50-57-139.mailcontrol.com
116.50.57.140	PTR	116-50-57-140.mailcontrol.com
116.50.57.140	A	cluster-k.cloud.threatseeker.com
116.50.57.140	A	rp.cloud.threatseeker.com
116.50.57.141	PTR	116-50-57-141.mailcontrol.com
116.50.57.143	PTR	116-50-57-143.mailcontrol.com
116.50.57.147	PTR	116-50-57-147.mailcontrol.com
116.50.57.147	A	hlfs-web-k.mailcontrol.com
116.50.57.150	PTR	116-50-57-150.mailcontrol.com
116.50.57.155	A+PTR	submission-k.mailcontrol.com
116.50.57.156	PTR	116-50-57-156.mailcontrol.com
116.50.57.161	PTR	116-50-57-161.mailcontrol.com
116.50.57.170	A+PTR	cpa.cluster-k.blackspider.com
116.50.57.170	A	cpa.surfcpa.com
116.50.57.170	A	asia.surfcpa.com
116.50.57.180	A+PTR	webdefence.cluster-k.forcepoint.net
116.50.57.180	A	webdefence.cluster-k.websense.net
116.50.57.180	A	webdefence.cluster-k.blackspider.com
116.50.57.190	PTR	cluster-k.mailcontrol.com
116.50.57.190	A	cust46554-1.in.mailcontrol.com
116.50.57.190	A	cust58745-1.in.mailcontrol.com
116.50.57.252	PTR	116-50-57-252.mailcontrol.com
116.50.58.1	PTR	lo0.rtr01m.mailcontrol.com
116.50.58.15	PTR	116-50-58-15.mailcontrol.com
116.50.58.140	PTR	116-50-58-140.mailcontrol.com
116.50.58.140	A	rp.cloud.threatseeker.com
116.50.58.140	A	emailsecurity.cloud.threatseeker.com
116.50.58.141	PTR	116-50-58-141.mailcontrol.com
116.50.58.141	A	threatscope.websense.net
116.50.58.141	A	shm.gns.forcepoint.net
116.50.58.150	PTR	116-50-58-150.mailcontrol.com
116.50.58.150	A	hybrid-web.global.blackspider.com
116.50.58.155	A	submission-m.mailcontrol.com
116.50.58.160	A	cluster-m.surfsrs.com
116.50.58.161	PTR	116-50-58-161.mailcontrol.com
116.50.58.161	A	pac.hybrid-web.global.blackspider.com
116.50.58.169	PTR	116-50-58-169.mailcontrol.com
116.50.58.169	A	iq.global.websense.net
116.50.58.180	A+PTR	webdefence.cluster-m.forcepoint.net
116.50.58.180	A	webdefence.cluster-m.websense.net
116.50.58.180	A	webdefence.global.blackspider.com
116.50.58.181	PTR	query.webdefence.cluster-m.mailcontrol.com
116.50.58.182	PTR	home.webdefence.cluster-m.mailcontrol.com
116.50.58.190	PTR	cluster-m.mailcontrol.com
116.50.58.190	A	cust59983-2.in.mailcontrol.com
116.50.58.190	A	cust47865-2.in.mailcontrol.com
116.50.59.47	PTR	116-50-59-47.mailcontrol.com
116.50.59.147	PTR	116-50-59-147.mailcontrol.com
116.50.59.149	PTR	116-50-59-149.mailcontrol.com
116.50.59.150	PTR	116-50-59-150.mailcontrol.com
116.50.59.169	PTR	116-50-59-169.mailcontrol.com
116.50.59.180	A+PTR	webdefence.cluster-c.forcepoint.net
116.50.59.180	A	webdefence.cluster-c.websense.net
116.50.59.190	PTR	cluster-c.mailcontrol.com
116.50.59.190	A	mail.vls-global.net
116.50.59.190	A	mail.vls-global.com
116.50.59.201	PTR	116-50-59-201.mailcontrol.com
116.50.59.211	PTR	116-50-59-211.mailcontrol.com
116.50.59.223	PTR	mail-03-c.mailcontrol.com
116.50.59.230	PTR	116-50-59-230.mailcontrol.com
116.50.59.231	PTR	116-50-59-231.mailcontrol.com
116.50.59.232	PTR	116-50-59-232.mailcontrol.com
116.50.59.233	PTR	116-50-59-233.mailcontrol.com
116.50.59.234	PTR	116-50-59-234.mailcontrol.com