Here is a table explaining difference between IP4 & IP6.
| Diff Type | IP4 | IP6 |
| Size | 32 | 128 |
| Format | Numeric & . | Alphanumeric and : |
| Example | 12.123.345.162 | 2001:0db8:0000:0000:0000:ff00:0042:7879 |
| Type of addresses | Unicast, broadcast, and multicast | Unicast, multicast, and any cast |
| NAT | Supports NAT (network address translation) which allows a single NAT address to mask thousands of non-routable addresses, this enables integrity of addresses. | Has vast address space and doesn’t need NAT |
| Security | Doesn’t have security built in | Has security built into it that can be used with a key infrastructure |