# uuidgen > Generate unique identifiers (UUIDs). > See also `uuid`. > More information: . - Create a random UUIDv4: `uuidgen {{[-r|--random]}}` - Create a UUIDv1 based on the current time: `uuidgen {{[-t|--time]}}` - Create a UUIDv5 of the name with a specified namespace prefix: `uuidgen {{[-s|--sha1]}} {{[-n|--namespace]}} {{@dns|@url|@oid|@x500}} {{[-N|--name]}} {{object_name}}`