roboto

[keyplyr]

UA: roboto
Protocol: HTTP/1.1
Robots.txt: No
Host: AWS
54.204.0.0 - 54.205.255.255
54.204.0.0/15

Tried non-www version of index page (blocked)
Then tried www version of index page (blocked)
Then tried www version of index page with same-page referer (blocked)
Then went away...

Then came back later a few times and repeated the process.
Didn't Tom Cruise & Emily Blunt make a movie about this?

[aristotle]

Today On one of my sites it made a visit from 52.90.50.xxx

[keyplyr]

Today On one of my sites it made a visit from 52.90.50.xxx

Yup, another of AWS ranges:
52.84.0.0 - 52.95.255.255
52.88.0.0/13, 52.84.0.0/14

This is kinda how cloud computing works. The account can use available computing from a wide area of the ranges assigned for that purpose.