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

```
STRING uuid.oid()
```

**Available in:** all subroutines

Returns the [RFC 4122](https://tools.ietf.org/html/rfc4122) identifier of the
ISO OID namespace, namely the constant `6ba7b812-9dad-11d1-80b4-00c04fd430c8`.

## Example

```vcl
declare local var.oid STRING;
set var.oid = uuid.version3(uuid.oid(), "2.999");
# var.oid is now "31cb1efa-18c4-3d19-89ba-df6a74ddbd1d"
```