IPv6 ULA generator
Generate IPv6 Unique Local Addresses (ULA)
Generated ULA Prefix
Regenerate
fd488f:09cf:3e00::/48
ULA Prefix (/48)fd488f:09cf:3e00::/48
Global ID (40-bit)488f09cf3e
Prefix typefd (Locally Assigned ULA, RFC 4193)
Address spacefd488f:09cf:3e00:0000::/64 through …ffff::/64
Subnets
fd488f:09cf:3e00:0001::/64
Example subnets (/64)
fd488f:09cf:3e00:0000::/64
fd488f:09cf:3e00:0001::/64
fd488f:09cf:3e00:0002::/64
fd488f:09cf:3e00:0003::/64
RFC 4193 defines Unique Local Addresses (ULAs) for use within private networks.
The fd::/8 range (L=1) uses a randomly generated 40-bit Global ID — collision probability with other networks is extremely low.
ULAs are not routable on the public internet but are unique enough to avoid conflicts when merging networks.