2001:db8::/32 (IPv6 Documentation)
Not routableRFC 3849
2001:db8::/32 at a glance
| CIDR block | 2001:db8::/32 |
|---|---|
| First address | 2001:db8:: |
| Last address | 2001:db8:ffff:ffff:ffff:ffff:ffff:ffff |
| Total addresses | 2⁹⁶ |
| Prefix mask | ffff:ffff:: |
| Prefix length | /32 |
| Type | Not routable |
| Publicly routable | No |
| Defined in | RFC 3849 |
What is 2001:db8::/32 used for?
2001:db8::/32 is reserved for IPv6 documentation and examples by RFC 3849. Use it in tutorials and sample configurations instead of real addresses. RFC 9637 added 3fff::/20 as a larger documentation block for examples that need more space.
FAQ
What IPv6 address should I use in examples?
2001:db8::/32 (RFC 3849). For examples that need many /32s, RFC 9637 also reserves 3fff::/20.
Is 2001:db8:: routable?
No. It must never appear on the internet and should be filtered.