5.9. Nil UUID

5.9. Nil UUID

The Nil UUID is special form of UUID that is specified to have all 128 bits set to zero.

00000000-0000-0000-0000-000000000000

Figure 13: Nil UUID Format

A Nil UUID value can be useful to communicate the absence of any other UUID value in situations that otherwise require or use a 128-bit UUID. A Nil UUID can express the concept "no such value here". Thus, it is reserved for such use as needed for implementation-specific situations.

Note that the Nil UUID value falls within the range of the Apollo NCS variant as per the first row of Table 1 rather than the variant defined by this document.