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

Registration Procedure(s)
Standards Action
Reference
[RFC3168]
Note
Please see the published RFC, Section 23.2, for further information.
Available Formats

CSV
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]