---
title: "CDN Resource Domains"
sidebar_label: "Domains"
description: "Types of CDN resource domains"
sidebar_position: 4
---

import Formbricks from '@theme/MDXComponents/Formbricks'

# CDN Resource Domains

Content can be distributed via the [default domain](#default-domain) and a [custom domain](#personal-domain).

## Default domain \{#default-domain}

A default domain of the `*.selcdn.net` type is automatically generated when [creating a CDN resource](/cdn/create-resource.mdx). An example of a default domain is `a051e1d7-9f5d-4325-a2d3-947e4cd635a3.selcdn.net`.

A (TLS)SSL certificate is automatically issued for the default domain. Content is distributed via the HTTPS protocol.

You can view the default domain in the [Control Panel](https://my.selectel.ru/cdn-v3): in the top menu, click **Products** → **CDN** → **CDN Resources** → CDN resource page → **General**.

We recommend adding a [custom domain](#personal-domain) to your CDN resource — using third-party domains may hinder site promotion and affect search engine rankings.

## Custom domain \{#personal-domain}

Content can be distributed under your own (custom) domain. In this case, requests will be forwarded to the [default domain](#default-domain) via a CNAME record.

Only a third-level subdomain of a primary domain can be used as a custom domain, for example, `cdn.example.com` for `example.com`. You cannot use a primary domain as a custom domain.

For a custom domain, you need to [issue a TLS (SSL) certificate](/cdn/resources/tls-ssl-certificates.mdx#generate-lets-encrypt-certificate) or upload a [custom certificate](/cdn/resources/tls-ssl-certificates.mdx#personal-certificate).

You can add a custom domain by following the instructions in [Add a custom domain to a CDN resource](/cdn/resources/add-personal-domain.mdx).

<Formbricks />