Robtex

Up: 54.240.224.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 54.240.228.0/23
Down right: 54.240.230.0/23

IP	Type	Hostname
54.240.231.0	PTR	s3-us-west-2.amazonaws.com
54.240.231.8	PTR	s3-us-west-2.amazonaws.com
54.240.231.16	PTR	s3-us-west-2.amazonaws.com
54.240.231.25	PTR	s3-us-west-2.amazonaws.com
54.240.231.29	PTR	s3-us-west-2.amazonaws.com
54.240.231.80	PTR	s3-us-west-2-w.amazonaws.com
54.240.231.192	PTR	s3-website-us-west-2.amazonaws.com
54.240.231.193	PTR	s3-website-us-west-2.amazonaws.com
54.240.231.194	PTR	s3-website-us-west-2.amazonaws.com
54.240.231.195	PTR	s3-website-us-west-2.amazonaws.com
54.240.231.196	PTR	s3-website-us-west-2.amazonaws.com