Network
IPv6 ULA Generator
Generate local IPv6 prefix candidates with a random 40-bit global ID under fd00::/8.
About this tool
When to use it
Generate local IPv6 prefix candidates with a random 40-bit global ID under fd00::/8.
How to use it
Choose a count, generate prefixes, and record the selected candidate in the network plan. Subdivide the /48 deliberately and check independently managed networks before joining them.
Guide updated . Examples checked against this implementation.
Worked examples
Recognize a locally assigned ULA
Input
How many: 1Expected output
fdxx:xxxx:xxxx::/48, where x represents a random hexadecimal digitThis is a shape example. The fixed fd prefix and random 40 bits identify the /48; subnet and host addressing are not generated here.
Errors and unsupported input
A ULA destination cannot be reached on the public internetUse the addressing and routing policy appropriate to that connection. ULA prefixes are intended for local routing, not public internet reachability.
Continue this workflow
- MAC Address Generator: Generate separate link-layer address fixtures when needed.
Questions
Frequently asked questions
Is /48 a single device address?
No. It is a network prefix. Allocate subnet and interface portions according to the network design.