Robtex

Up: 54.231.2.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 54.231.3.0/25
Down right: 54.231.3.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
54.231.3.2	PTR	s3-console-us-standard.console.aws.amazon.com
54.231.3.5	PTR	s3-1-w.amazonaws.com
54.231.3.6	PTR	s3-website-us-east-1.amazonaws.com
54.231.3.6	A	kyteratech.com
54.231.3.6	A	muffinelse.com