processing page/post requests

If I make a request to a non-existent page on a wordpress blog and monitor the 404 errors that are sent out, I see the IP address where I made this request from (normal and expected), and I also see a the IP address of a server seeming to be located in Mountain View CA. This server is making the same request for the same non-existent page as my request and it receives the same 404 error. What is up with this? I don’t understand. But I can understand if you’ll explain it to me – I think it might be akismet but I’m not sure and don’t understand why it would be doing this – I’m still looking.