Network protocols
TCP options decoder
Decode option kinds, lengths, MSS, window scale and timestamps.
Your inputs
Start with an exampleYour result
Example resultAa — A small example of your colors.
How it works
Walk the option area. Kind 0 ends it, kind 1 is a one-byte NOP, and other options include a length covering kind and length bytes.
02 04 05 B4 is an MSS option with value 1460.
Limits
Paste option bytes only, without the TCP header. Unknown kinds retain raw data; this does not validate an entire packet or checksum.