TCP Flag Decoder

SanchitGurukul Networking Tools

TCP Flag Decoder

Decode decimal, hexadecimal, binary, or named TCP flags and build a flag value by selecting individual control bits.

Decode a flag value

TCP flags

Accepted formats: decimal, hexadecimal, binary, or flag names separated by spaces, commas, plus signs, or pipes.

Build a value

NSNonce Sum CWRCongestion Window Reduced ECEECN Echo URGUrgent Pointer Valid ACKAcknowledgement Valid PSHPush Data RSTReset Connection SYNSynchronize Sequence Numbers FINFinish Connection

Decoded result

Decimal18

Hexadecimal0x12

Binary (9-bit)000010010

Active flags SYN, ACK

SYN-ACK: acknowledges a connection request and synchronizes sequence numbers.

Flag	Bit	Status	Meaning

Common TCP flag combinations

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