Subnet address in apache access log

Posted by m0ntassar on Server Fault See other posts from Server Fault or by m0ntassar
Published on 2012-10-22T16:07:33Z Indexed on 2012/10/22 17:03 UTC
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apache2

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networking

I was inspecting my apache access logs(I use default combined log format) and I came a cross a wired entry

69.171.247.0 - - [22/Oct/2012:18:15:20 +0200] "GET /some site resources HTTP/1.1" 404 514 "-" "facebookexternalhit/1.0 (+http://www.facebook.com/externalhit_uatext.php)"

As u see, this query come from a facebook robot that extract objects from site when somebody post a link. What I find weird is the logged ip address : 69.171.247.0

Does anybody know how is that possible ?

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