Why is amazonaws scanning my website?

[LocalGhost]

I have been getting several users trying to login to websites and getting hits from different IP addresses of amazonaws.com domain

For Eg:
United States Ashburn, United States
IP: 54.175.39.73 [unblock] [permanently blocked]
Reason: Manual block by administrator
Hostname: ec2-54-175-39-73.compute-1.amazonaws.com

and last week, I banned their entire range via htaccess:
deny from 67.202.

and now they are trying to access using different IP Range

I know it's not a search engine so can we safely bar amazonaws ip addresses? and I am wondering they might have a massive traunch of ip addresses at their disposal (the whole amazon network), so it won't be that easy to block individual range for each login attempt.

I am sure that everyone might have experienced these scans should I block all access to a website for amazonaws.com

[kirstie]

Probably someone running an SEO tool on Amazon cloud to analyse your websites.

[grumble]

It will be a bot - Search G for blocking bots in htaccess or in your server config if you are running a vps