Robtex

Up: 54.240.198.0/24
Can't show all results, try to descend to a more specific CIDR
Down left: 54.240.198.128/26
Down right: 54.240.198.192/26
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
54.240.198.128	PTR	54-240-198-128.amazon.com
54.240.198.131	PTR	54-240-198-131.amazon.com
54.240.198.132	PTR	54-240-198-132.amazon.com
54.240.198.133	PTR	54-240-198-133.amazon.com
54.240.198.136	PTR	54-240-198-136.amazon.com
54.240.198.137	A+PTR	54-240-198-137.amazon.com
54.240.198.138	PTR	54-240-198-138.amazon.com
54.240.198.146	PTR	54-240-198-146.amazon.com
54.240.198.147	PTR	54-240-198-147.amazon.com
54.240.198.148	PTR	54-240-198-148.amazon.com
54.240.198.150	PTR	54-240-198-150.amazon.com
54.240.198.151	A+PTR	54-240-198-151.amazon.com
54.240.198.154	A+PTR	54-240-198-154.amazon.com
54.240.198.154	A	vpn.ivpn.amazon-corp.com
54.240.198.154	A	sfo-orca-bak.amazon.com
54.240.198.156	PTR	54-240-198-156.amazon.com
54.240.198.157	PTR	54-240-198-157.amazon.com
54.240.198.158	PTR	54-240-198-158.amazon.com
54.240.198.158	A	sfo-orca-bak.amazon.com
54.240.198.158	A	sfo-orca.amazon.com
54.240.198.169	PTR	54-240-198-169.amazon.com
54.240.198.172	PTR	54-240-198-172.amazon.com
54.240.198.173	PTR	54-240-198-173.amazon.com
54.240.198.178	PTR	54-240-198-178.amazon.com
54.240.198.179	PTR	54-240-198-179.amazon.com
54.240.198.182	PTR	54-240-198-182.amazon.com
54.240.198.183	A+PTR	54-240-198-183.amazon.com
54.240.198.184	PTR	54-240-198-184.amazon.com
54.240.198.191	A+PTR	54-240-198-191.amazon.com
54.240.198.193	PTR	54-240-198-193.amazon.com
54.240.198.194	PTR	54-240-198-194.amazon.com
54.240.198.197	A	54-240-198-197.amazon.com
54.240.198.202	PTR	54-240-198-202.amazon.com
54.240.198.204	PTR	54-240-198-204.amazon.com
54.240.198.205	A+PTR	54-240-198-205.amazon.com
54.240.198.206	PTR	54-240-198-206.amazon.com
54.240.198.213	PTR	54-240-198-213.amazon.com
54.240.198.214	PTR	54-240-198-214.amazon.com
54.240.198.223	PTR	54-240-198-223.amazon.com
54.240.198.229	PTR	54-240-198-229.amazon.com
54.240.198.232	PTR	54-240-198-232.amazon.com
54.240.198.234	PTR	54-240-198-234.amazon.com
54.240.198.238	PTR	54-240-198-238.amazon.com
54.240.198.239	PTR	54-240-198-239.amazon.com
54.240.198.242	PTR	54-240-198-242.amazon.com
54.240.198.245	A+PTR	54-240-198-245.amazon.com
54.240.198.247	PTR	54-240-198-247.amazon.com
54.240.198.250	PTR	54-240-198-250.amazon.com
54.240.198.251	PTR	54-240-198-251.amazon.com
54.240.198.252	PTR	54-240-198-252.amazon.com