Unique local IPv6 address
fd00:1:fd00:1:fd00:1:fd00:1 is for private IPv6 networking.
This address belongs to fc00::/7, the unique local IPv6 address space. It can be used and routed
inside a home network, organisation, VPN, lab, or cloud environment, but it is not intended to be routed on the public Internet.
Technical details
- IPv6
- fd00:1:fd00:1:fd00:1:fd00:1
- IP Classification
- Unique local IPv6 address
- CIDR
- fc00::/7
- Local Assignment Prefix
- fd00::/8
- Site Prefix
- fd00:1:fd00::/48
- Scope
- Private network or organisation
- Publicly Routable
- No
Common uses
- Stable internal addressing for homelabs, servers, virtual machines, and containers.
- Private IPv6 routing between offices, sites, or VPN-connected networks.
- Internal DNS records and services that must not be exposed to the public Internet.
What is the difference between fd00::/8 and fe80::/10?
A link-local address in fe80::/10 only works on one network segment. A unique local address can be
routed through your own internal IPv6 network, making it suitable for multiple subnets, VPNs, and private services.
Is fd00::1 a default router address?
No. Unlike some familiar IPv4 private addresses, there is no universal IPv6 router address. Each network chooses
its own unique-local prefix. The derived internal site prefix for this address is
fd00:1:fd00::/48.
Can a unique local IPv6 address be used on the Internet?
No. It is designed for private use and should be filtered at network boundaries. Use a globally routed IPv6 prefix assigned by your provider when a service needs to be accessible from the public Internet.