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An Internet Protocol version 4 packet header (IPv4 packet header) contains application information, including usage and source/destination addresses. IPv4 packet headers contain 20 bytes of data and are normally 32 bits long.
A packet is a network communication data unit containing fixed or variable lengths. However, a single packet contains three portions: header, body and trailer.
A 20-byte header contains almost 13 multipurpose fields, which hold specific related object information such as application, data type and source/destination addresses. The following are detailed header field descriptions: