[luos]

It's possible that your site's IP was used previously for some other sites and it was indexed as http://IP/... now google will retry to fetch the urls for a time.

Maybe you have someone's domain resolving to your IP. Seems to me that nginx is resolving the IP to the default site in the config.

[otp124]

I think it is likely the first option (site IP was previously used), as I searched for some of those paths and they look to be spread across different domains. Perhaps a shared host with many domains pointing to the same IP?

[emilfihlman]

I've had the same IP for 4 years. I think it's unlikely that Google started scanning after 4 years.

[emilfihlman]

Hmm, someone elses domain resolving to my site seems plausible.

[emilfihlman]

I've had my ip for the last 4 years.