---
title: cf.tls_client_auth.cert_subject_dn_rfc2253
description: The Distinguished Name (DN) of the owner (or requester) of the mTLS client certificate in [RFC 2253](https://datatracker.ietf.org/doc/html/rfc2253) format.
image: https://developers.cloudflare.com/core-services-preview.png
---

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#  cf.tls\_client\_auth.cert\_subject\_dn\_rfc2253 

`cf.tls_client_auth.cert_subject_dn_rfc2253` ` String ` 

The Distinguished Name (DN) of the owner (or requester) of the mTLS client certificate in [RFC 2253](https://datatracker.ietf.org/doc/html/rfc2253) format.

This field defaults to `""` if the connection does not use [mTLS authentication](https://developers.cloudflare.com/ssl/client-certificates/enable-mtls/).

Example value:

```
"CN=James Royal,OU=Access Admins,O=Access,L=Austin,ST=Texas,C=US"
```

Categories: 
* Request
* mTLS

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