# cf.tls\_client\_auth.cert\_issuer\_dn

`cf.tls_client_auth.cert_issuer_dn` String

The Distinguished Name (DN) of the Certificate Authority (CA) that issued the certificate included in the request.

This field is only filled in if the request includes a client certificate for [mTLS authentication](https://developers.cloudflare.com/ssl/client-certificates/enable-mtls/).

Example value:

```txt
"CN=Access Testing CA,OU=TX,O=Access Testing,L=Austin,ST=Texas,C=US"
```

Categories:

* Request
* mTLS
