Predefined Namespaces

RFC 4122 defines a handful of UUIDs to use with “for some potentially interesting name spaces.”

Constant

Description

Uuid::NAMESPACE_DNS

The name string is a fully-qualified domain name.

Uuid::NAMESPACE_URL

The name string is a URL.

Uuid::NAMESPACE_OID

The name string is an ISO object identifier (OID).

Uuid::NAMESPACE_X500

The name string is an X.500 DN in DER or a text output format.