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website/docs/language/functions/uuidv5.mdx

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+---
+page_title: uuidv5 - Functions - Configuration Language
+description: >-
+  The uuidv5 function generates a uuid v5 string representation of the value in
+  the specified namespace.
+sidebar_title: uuidv5
+---
+
+# `uuidv5` Function
+
+`uuidv5` generates a _name-based_ UUID, as described in
+[RFC 4122 section 4.3](https://tools.ietf.org/html/rfc4122#section-4.3),
+also known as a "version 5" UUID.
+
+```
+uuidv5(namespace, name)
+```
+
+Unlike the pseudo-random UUIDs generated by
+[`uuid`](/language/functions/uuid), name-based UUIDs derive from namespace and an name,
+producing the same UUID value every time if the namespace and name are
+unchanged.
+
+Name-based UUID namespaces are themselves UUIDs, but for readability this
+function accepts some keywords as aliases for the namespaces that were
+assigned by RFC 4122:
+
+| Keyword  | Namespace ID                           | Name format                                                                  |
+| -------- | -------------------------------------- | ---------------------------------------------------------------------------- |
+| `"dns"`  | `6ba7b810-9dad-11d1-80b4-00c04fd430c8` | A fully-qualified DNS domain name.                                           |
+| `"url"`  | `6ba7b811-9dad-11d1-80b4-00c04fd430c8` | Any valid URL as defined in [RFC 3986](https://tools.ietf.org/html/rfc3986). |
+| `"oid"`  | `6ba7b812-9dad-11d1-80b4-00c04fd430c8` | An [ISO/IEC object identifier](https://oidref.com/)                          |
+| `"x500"` | `6ba7b814-9dad-11d1-80b4-00c04fd430c8` | [X.500 Distinguished Name](https://tools.ietf.org/html/rfc1779)              |
+
+To use any other namespace not included in the above table, pass its assigned
+namespace ID directly in the first argument in the usual UUID string format.
+
+## Examples
+
+Use the namespace keywords where possible, to make the intent more obvious to
+a future reader:
+
+```
+> uuidv5("dns", "www.terraform.io")
+a5008fae-b28c-5ba5-96cd-82b4c53552d6
+
+> uuidv5("url", "https://www.terraform.io/")
+9db6f67c-dd95-5ea0-aa5b-e70e5c5f7cf5
+
+> uuidv5("oid", "1.3.6.1.4")
+af9d40a5-7a36-5c07-b23a-851cd99fbfa5
+
+> uuidv5("x500", "CN=Example,C=GB")
+84e09961-4aa4-57f8-95b7-03edb1073253
+```
+
+The namespace keywords treated as equivalent to their corresponding namespace
+UUIDs, and in some special cases it may be more appropriate to use the
+UUID form:
+
+```
+> uuidv5("6ba7b810-9dad-11d1-80b4-00c04fd430c8", "www.terraform.io")
+a5008fae-b28c-5ba5-96cd-82b4c53552d6
+```
+
+If you wish to use a namespace defined outside of RFC 4122, using the namespace
+UUID is required because no corresponding keyword is available:
+
+```
+> uuidv5("743ac3c0-3bf7-4a5b-9e6c-59360447c757", "LIBS:diskfont.library")
+ede1a974-df7e-5f17-84b9-76208818b2c8
+```
+
+When using raw UUID namespaces, consider including a comment alongside the
+expression that indicates which namespace this represents in a
+human-significant manner, such as by reference to the standard that
+defined it.
+
+## Related Functions
+
+* [`uuid`](/language/functions/uuid), which generates pseudorandom UUIDs.