Couldn't find anything relevant so here's a new listing, including the one I found today. These are all the ones I know of.
Amazon Server Ranges
8.18.144.0 - 8.18.145.255
23.20.0.0 - 23.23.255.255
27.0.0.0 - 27.0.3.255
35.152.0.0 - 35.183.255.255
46.51.128.0 - 46.51.255.255
46.137.0.0 - 46.137.255.255
50.16.0.0 - 50.19.255.255
50.112.0.0 - 50.112.255.255
52.0.0.0 - 52.31.255.255
52.32.0.0 - 52.63.255.255
52.64.0.0 - 52.95.255.255
52.192.0.0 - 52.223.255.255
54.64.0.0 - 54.95.255.255
54.144.0.0 - 54.221.255.255
54.224.0.0 - 54.255.255.255
67.202.0.0 - 67.202.63.255
72.21.192.0 - 72.21.223.255
72.44.32.0 - 72.44.63.255
75.101.128.0 - 75.101.255.255
79.125.0.0 - 79.125.127.255
87.238.80.0 - 87.238.87.255
96.127.0.0 - 96.127.127.255
103.4.8.0 - 103.4.15.255
107.20.0.0 - 107.23.255.255
122.248.192.0 - 122.248.255.255
174.129.0.0 - 174.129.255.255
175.41.128.0 - 175.41.255.255
176.32.64.0 - 176.32.127.255
176.34.0.0 - 176.34.255.255
177.71.128.0 - 177.71.255.255
178.236.0.0 - 178.236.15.255
184.72.0.0 - 184.73.255.255
184.169.128.0 - 184.169.255.255
185.48.120.0 - 185.48.123.255
199.255.192.0 - 199.255.195.255
204.236.128.0 - 204.236.255.255
205.251.192.0 - 205.251.255.255
207.171.160.0 - 207.171.191.255
216.182.224.0 - 216.182.239.255
[edited by: keyplyr at 9:23 pm (utc) on Oct 18, 2016]
[edit reason] merged with ongoing server farms thread [/edit]