Private address
fc00::/7
fc00::/7 is IPv6's private block, unique local addresses (RFC 4193). It isn't routed on the public internet, so there's nothing public to look up.
At a glance
- Block
- fc00::/7
- Defined in
- RFC 4193
- On the public internet
- No
About this block
fc00::/7 is IPv6's equivalent of the private IPv4 ranges. In practice addresses start with fd, followed by a random 40-bit prefix that each network picks for itself, so two private networks rarely clash when they're joined.
Where you'll see it
- Home and office networks that use IPv6 internally.
- VPNs, containers and Kubernetes clusters.