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TCP/IP header

Here is the full TCP/IP header:


Bytes Description
0 bits 0-3: Version, bits 4-7: Internet Header Length (IHL)
1 Type of service (TOS)
2-3 Length
4-5 Identification
6-7 bits 0-3: Flags, bits 4-15: Offset
8 Time to live (TTL)
9 Type
10-11 Checksum
12-15 Source IP address
16-19 Destination IP address
20-IHL*4-1 Options + padding to round up to four bytes
0-1 Source Port
2-3 Destination Port
4-7 Sequence Number
8-11 Acknowledgement Number
12 bits 0-3: number of bytes of additional TCP Options / 4
13 Control
14-15 Window
16-17 Checksum
18-19 Urgent Pointer
20-20+Options*4 Options + padding to round up to four bytes
TCP Data begins at IHL*4+20+Options*4 and ends at Length-1


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