Addon Domains

Addon domain (sometimes labeled simply as an extra domain) lets you run another domain on the same hosting account as your primary site. Each domain can have its own website files, its own document root, and usually its own email — while still sharing the account’s disk, bandwidth, inodes, and CPU.

You will see this most often on cPanel shared hosting. Other panels use different names, but the idea is the same: multiple domains, one plan.

A Simple Analogy

Think of the hosting account as a house on one utility meter. The primary domain is the main house. An addon domain is another building on the same lot with a different street address.

Visitors to address B do not automatically walk into address A’s living room — but if the shared power (resources) runs out, every building feels it.

How It Works

When someone visits an addon domain:

1. That domain’s DNS points at your hosting server
2. The server matches the hostname (virtual host)
3. The request is mapped to a document root folder for that domain
4. Files in that folder are what visitors see

In cPanel, adding an addon domain typically also creates:

• A new document root folder
• An internal technical subdomain (often invisible in day-to-day use)
• The option to create mailboxes for that domain

Point the domain’s nameservers or A record at the hosting server before you judge the result in a browser.

Addon vs Parked/Alias vs Subdomain

If you only want newbrand.com to show the same site as the primary domain, you usually need an alias/parked domain or a redirect — not a full addon.

Benefits and Limits

• One hosting bill for several small sites
• Email per domain ([email protected])
• Cleaner file separation than dumping every project in one folder

• Resources are still shared — one heavy site can starve the others
• Providers often cap how many addon domains you get
• Backups, SSL, and CMS updates remain per site
• Busy traffic or strict isolation is healthier on a VPS or separate accounts

Quick Setup in cPanel

Typical flow (labels vary slightly):

1. Sign in to cPanel
2. Open Domains / Addon Domains
3. Enter the new domain name
4. Set or accept the document root
5. Save, then confirm DNS points at the server
6. Issue SSL/TLS (often Let’s Encrypt) for that domain
7. Upload files or install a CMS into the document root

What to Watch For

• Multi-site on shared is not full isolation — your other sites on the account are noisy neighbors to each other
• Watch disk and inodes — multiple CMS installs, caches, and mailboxes burn inodes quickly
• SSL is per domain — HTTPS on domain A does not automatically cover domain B
• Tighten FTP when needed — create FTP/SFTP users limited to the addon folder, not the whole home directory
• Read the provider’s terms — some plans discourage “stealth reselling” or too many production businesses on one shared account

FAQ