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Difference between IPv4 and IPv6
| S.No. | IPv4 | IPv6 |
|---|---|---|
| 1 | IPv4 addresses are 32 bit length. | IPv6 addresses are 128 bit length. |
| 2 | IPv4 addresses are binary numbers represented in decimals. | IPv6 addresses are binary numbers represented in hexadecimals. |
| 3 | IPSec support is only optional. | Inbuilt IPSec support. |
| 4 | Checksum field is available in IPv4 header | No checksum field in IPv6 header. |
| 5 | Options fields are available in IPv4 header. | No option fields, but IPv6 Extension headers are available. |
| 6 | IPv4 address uses a subnet mask. | IPv6 uses a prefix length. |
| 7 | IPv4 is subdivided into classes (A to E) | IPv6 is classless. |
| IPv6 uses a prefix and an Identifier ID known as IPv4 network | ||
| 8 | IPv4 header has 20 bytes. | IPv6 header is the double, it has 40 bytes. |