Had loads of this yesterday in the Apache log from the same IPNote, this was not a GET request.
A possible hack attempt or nothing to worry about ???

A head request asks the server to reply with the document headers. Here is an example server reply to a head request:

HTTP/1.1 200 OK
Date: Fri, 29 Aug 2003 17:59:13 GMT
Server: Apache/1.3.27
Cache-Control: max-age=86400, must-revalidate
Last-Modified: Tue, 26 Aug 2003 22:19:18 GMT
ETag: "c20bf0-216b-3f4bdce6"
Accept-Ranges: bytes
Content-Length: 8555
Connection: close
Content-Type: text/html

The "/" is the resource indicator, or in this case root index of your site.
So if you have, say, "index.html" in the root directory of your web site, the request "GET / HTTP/1.1" is a request for that file.

So I would say not much hto worry about.

HEAD requests are used to get information about the server like banner/software/version/proxy-ability checks. I think it would be "better" to say that "nothing to worry about" means you knowing what restrictions are in place and those restrictions being suitable for your setup. Make sure proxying capabilities are disabled or access is restricted by means of at least one of the following: router, TCP wrappers, firewall, httpd.conf (in this case more is better).

Thanks for your reply.
There was no GET index or image etc, Just: HEAD / HTTP/1.1
And at one point there were 63 requests for HEAD / HTTP/1.1 from the same IP which continued for several hours.