Robtex

Up: 116.50.56.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 116.50.57.0/25
Down right: 116.50.57.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
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