GUID.org - How it Works
GUID.org works by assigning each browser a unique, essentially random
16-byte user ID, which is represented as 32 hexadecimal digits. This
ID is constructed by applying a MD5 hash to a string concatenated from
the IP address of the requestor, the IP address of this server, the
date, and the time of day in ticks. The ID is then set as a cookie
from GUID.org.
Sites wishing to get a browser's GUID insert some HTML
in their page, which causes the GUID.org server to send the GUID via a
redirect to the site's GUID receiver. The site then may choose
to set their own cookie containing the GUID - see our
site usage instructions for more information on
how to use GUIDs.
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