TCP Flag Decoder Decode a TCP control flag byte (CWR/ECE/URG/ACK/PSH/RST/SYN/FIN). Save Flag byte 0x02 (SYN) 0x12 (SYN+ACK) 0x18 (PSH+ACK) 0x04 (RST)DecodedEnter a value like 0x18 or 24.