Packet AnalysisLOCALRuns in your browser
TCP Decoder
Decode TCP ports, sequence numbers, flags, window, options, and payload from a raw segment.
This tool handles input and primary processing in your browser and is designed not to send the input to QuickKit’s server.
Decoded fields
Remaining payload
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How it works
Paste a TCP segment beginning at the source port. Data offset and option bounds are validated. The checksum is displayed but not declared valid or invalid because a TCP checksum requires the IPv4/IPv6 pseudo-header, which this standalone input does not provide.