The Source Address Field is the source address field in headers of transport protocols and network protocols. It contains the source address at which the data packet is sent.
Depending on the protocol, the source address field can be 32 bits or even 128 bits. In the IP header of the IPv4 protocol, the data field for the source address has a size of 32 bits. In the IPv4 version IP header, the source address data field has a scope of 32 bits.
In this data field, the hexadecimal coded address is stored by the computer that generated the datagram. Version 6, IPv6, has an address range of 16 octets, or 128 bits.