What is UUID v3?

UUID v3 is a namespace-based UUID, meaning it is generated using a namespace and a name. The namespace is itself a UUID, and the name can be any string. RFC 4122 presents some potentially interesting namespaces for application in UUID v3:

• DNS - 6ba7b810-9dad-11d1-80b4-00c04fd430c8
• URL - 6ba7b811-9dad-11d1-80b4-00c04fd430c8
• OID - 6ba7b812-9dad-11d1-80b4-00c04fd430c8
• X.500 - 6ba7b814-9dad-11d1-80b4-00c04fd430c8