Packet Diagram (TCP header)
Bit-field layout of a TCP segment header.
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0-15: "Source port"
16-31: "Destination port"
32-63: "Sequence number"
64-95: "Acknowledgement number"
96-99: "Data offset"
100-105: "Reserved"
106: "URG"
107: "ACK"
108: "PSH"
109: "RST"
110: "SYN"
111: "FIN"
112-127: "Window"
128-143: "Checksum"
144-159: "Urgent pointer"
160-191: "Options + padding"
192-223: "Data (variable)"