Hey,

>> How many of those sites are served by CDN's, for example?
>
> I don't know, if you have a semi-robust way to detect that I'm willing to 
> implement it.
>
> Though, the scan was more of a ballpark estimate than a truly representative 
> result.

Whois the IP? That should work for majority of the CDN.

For Amazon, you can distinguish S3 from CloudFront by looking for at
the HTTP headers:
- X-Amz-Cf-Id,
- Via: ... .cloudfront.net (CloudFront),
- X-Cache: ... from cloudfront.

Best regards,
Piotr Sikora
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