Transmission Control Protocol (TCP) Header Flags

   Created
           2001-08-15

   Last Updated
           2018-01-16

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   Registry included below

     * TCP Header Flags

TCP Header Flags

   Registration Procedure(s)

 Standards Action

   Reference
           [RFC3168]

   Note

 Please see the published RFC, Section 23.2, for further information.

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   Bit                               Name                                Reference
   7   Reserved, previously used by Historic [RFC3540] as NS (Nonce Sum) [RFC8311]
   8   CWR (Congestion Window Reduced)                                   [RFC3168]
   9   ECE (ECN-Echo)                                                    [RFC3168]