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Glossary Networking

Unique local address (ULA)

A unique local address is a private IPv6 address in `fc00::/7`, used inside a site or between sites but not routed on the public internet.

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In more detail

In practice a ULA is fd followed by a random 40-bit global ID, making a /48 prefix such as fd12:3456:789a::/48; the randomness makes clashes between networks unlikely. It is the IPv6 counterpart of 10.0.0.0/8 and 192.168.0.0/16.

Try these tools

IPv6 ULA Generator

Generate a random IPv6 Unique Local Address /48 prefix (fdxx:xxxx:xxxx::/48) with its /64 subnets.

Random IP Address Generator

Generate a random IPv4 address, optionally constrained to a specific CIDR range.

Random MAC Address Generator

Generate a cryptographically random MAC address, with an optional locally-administered or multicast bit.

See also

  • Glossary IPv6
    IPv6 is the newer version of the Internet Protocol, using 128-bit addresses to replace the nearly exhausted 32-bit IPv4 space.
  • Glossary IP address
    An IP address is the number that identifies a device on a network so that data can be sent to it.
  • Glossary MAC address
    A MAC address is the 48-bit hardware identifier of a network interface, used to deliver data within a local network.
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