PlantUML — TCP Packet Layout

TCP header bit-field layout rendered with json-style nested blocks.

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@startjson
{
  "TCP header (160 bits)": {
    "[ 0-15]  Source port":          "16 bits",
    "[16-31]  Destination port":     "16 bits",
    "[32-63]  Sequence number":      "32 bits",
    "[64-95]  Acknowledgement #":    "32 bits",
    "[96-99]  Data offset":          "4 bits",
    "[100-105] Reserved":            "6 bits",
    "[106-111] Flags":               "URG/ACK/PSH/RST/SYN/FIN",
    "[112-127] Window":              "16 bits",
    "[128-143] Checksum":            "16 bits",
    "[144-159] Urgent pointer":      "16 bits"
  }
}
@endjson