Hi,

In IP header,

total length field = 16 bits, so length can be 65536(2**16) octets.

Fragment offset field = 13 bits, so no of fragments can be 8192(2**13) octets.

so, 65536/8192= 8, so each fragment should be of 8 octets.

For more information refer RFC 791 - Internet Protocol.

Hope this helps.

Thanks,

Vijaybabu