---
title: uuid.x500
summary: null
url: https://www.fastly.com/documentation/reference/vcl/functions/uuid/uuid-x500
---

```
STRING uuid.x500()
```

**Available in:** all subroutines

Returns the [RFC 4122](https://tools.ietf.org/html/rfc4122) identifier of the
X.500 namespace, namely the constant `6ba7b814-9dad-11d1-80b4-00c04fd430c8`.

## Example

```vcl
declare local var.x500 STRING;
set var.x500 = uuid.version3(uuid.x500(), "CN=Test User 1, O=Example Organization, ST=California, C=US");
# var.x500 is now "addf5e97-9287-3834-abfd-7edcbe7db56f"
```