Revealing hosts sharing an IP address using TCP option

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Last updated 2012-06-10 (latest revision 2011-12-08)
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When an IP address is shared among several subscribers -- with a NAT or with an application-level proxy -- it is impossible for the server to differentiate between different clients. Such differentiation is valuable in several scenarios. This memo describes a technique to differentiate TCP clients sharing an IP address. The proposed method uses a TCP option, which avoids altering the application-level payload and works well with SSL-protected connections.


Andrew Yourtchenko (
Dan Wing (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)