| IPv4 | IPv6 |
| IPv4 has 32-bit address length. | IPv6 has 128-bit address length. |
| IPv4 addresses represent the binary numbers in decimals. | IPv6 addresses express binary numbers in hexadecimal. |
| IPv4 uses checksum field in the header format for handling error checking. | IPv6 removes the header checksum field. |
| Header length of IPv4 is 20 bytes. | Header length of IPv6 is 40 bytes. |
| The header length field which is present in IPv4. | The header length field is eliminated in IPv6 because the length of the header is fixed in this version. |
| IPv4 doesn’t provide authentication and encryption. | IPv6 provides authentication and encryption |
| IPv4 requires an intermediate router to fragment any datagram that is too large. | IPv6 uses end-to-end fragmentation. |
| IPv4 uses broadcasting to transmit the packets to the destination computers. | IPv6 uses multicasting and anycasting. |
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