Robtex

Up: 172.240.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 172.240.48.0/23
Down right: 172.240.50.0/23

IP	Type	Hostname
172.240.50.16	PTR	172.240.50.16.rdns.as15003.net
172.240.50.28	PTR	172.240.50.28.rdns.ubiquity.io
172.240.50.42	PTR	172.240.50.42.rdns.as15003.net
172.240.50.221	PTR	172.240.50.221.rdns.as15003.net
172.240.50.238	A	vgzzhixinda.com
172.240.51.53	PTR	172.240.51.53.rdns.as15003.net