Hosting Glossary
What is Addon Domain?
Addon Domain in plain English — the definition, the analogy, and why it matters to anyone who runs a website.
The short answer
An addon domain is a second, fully independent website hosted on the same hosting account — its own domain, folder and content sharing the account's resources.
The sections below unpack it properly — how it works, why a site owner should care, and a concrete example of it in the wild.
Written by the HostingAlly team · Last revised 27 July 2026
0
Jargon left unexplained
100+
Linked definitions
Real
Platform examples
Free
To read, obviously
The account's plan allowance decides how many you may add; each gets its own document root, email addresses and SSL, behaving as a complete site in every visitor-facing way.
The invisible caveat is shared fate — all addon domains ride the same account's resources, security posture and suspension status, which is efficient for one owner and reckless across different owners.
A picture that makes Addon Domain stick
Extra market stalls under one trader's licence — separate signage and stock, but one licence-holder whose standing covers them all.
Analogies simplify, of course — but this one holds up well enough to reason with, and reasoning is the point of a glossary.
Why you should care
It's the economical way to run a personal portfolio of sites — and the wrong way to host clients, whose sites deserve the isolation of separate accounts (the reseller model exists exactly for that).
You don't need to operate this layer daily — you need to recognise it when it's the explanation for something, which is exactly when this page pays for itself.
Addon Domain in the wild
A hobbyist runs their blog, a family recipe site and a local club's page as three addon domains on one Pro plan — three sites, one bill, one login.
Multiply that example across every site on the internet and you have the concept's entire job description.
Where you'll meet it on our platform
On our hosting this mostly takes care of itself — the platform applies the sensible defaults, and the panel exposes the controls when you want them. The concepts worth knowing next: Subdomain, Parked Domain, Shared Hosting and Reseller Hosting.
Our team migrates existing sites free of charge, typically within 24 hours and with zero downtime.
Why we wrote a hundred definitions
We think unexplained jargon is a service failure — this glossary is the support desk's accumulated translations, published where the search engines can hand them out.
Renewal prices match signup prices, so the year-two invoice is the most boring email you'll get from us.
- 100+ terms, plain English
- Analogies and real examples
- Cross-linked related concepts
- Written by the support desk
Why HostingAlly
Every plan includes this, whatever you pay
The practical stakes named
Not just what it is — when it's the answer to a problem you're having.
Linked, not siloed
Related terms cross-reference, so one lookup becomes a working understanding.
One term, fully landed
Addon Domain defined, pictured by analogy and placed in your own control panel — recognise-level in a single read.
Analogies that stick
Each concept gets a picture you'll remember at the moment you actually need it.
Plain English first
Every term defined for site owners, not for other sysadmins — jargon translated, not restated.
Honest about what you can skip
Most terms are recognise-level, not operate-level — the glossary says which is which.
Getting Started
How to get going
- 1
Spot it in your own setup
Open your control panel and find where this concept lives — seeing it attached to your own site is what converts definition into understanding.
- 2
Check the defaults
Confirm how your account has this configured — usually correctly by default here, and now you'll know rather than guess.
- 3
Follow the related terms
Concepts travel in packs — Subdomain, Parked Domain and Shared Hosting complete this one's picture, and each is a two-minute read away.
Included
What's covered on our plans
- Webmail plus IMAP, POP and SMTP access
- 30-day money-back guarantee on hosting plans
- Upgrades apply in place — no migrations between plans
- NVMe SSD storage as standard
- 99.9% uptime commitment, monitored around the clock
- Free WebP image optimisation built in
- Free SSL certificate on every plan, renewed automatically
- Renewal prices that match signup prices
- WordPress Toolkit with automatic updates
- cPanel — the industry-standard control panel
FAQ
Your questions, answered
Do addon domains look different to visitors?
Indistinguishable from any standalone site — own domain, own SSL, own content. The 'addon' arrangement is entirely a hosting-account concept invisible from outside.
Why shouldn't I host client sites as addon domains?
Correlated failure and tangled ownership — one compromise or suspension reaches every co-housed site, and a departing client's site is knotted into your personal account. Isolation via reseller accounts is the professional structure.
Do you support staging sites?
Yes — plans with staging let you clone the live site, test changes safely, and push to production when ready. It's the difference between 'I hope this update works' and knowing it does.
How do I read my email away from my desk?
Webmail works from any browser, and every mailbox also supports IMAP, POP and SMTP — so your phone's mail app, desktop client and webmail all see the same messages.
Which control panel do you provide?
cPanel — the industry standard, which means every tutorial on the internet matches your screen, your backups restore anywhere cPanel runs, and skills learned here transfer for life. Plesk and DirectAdmin options exist on specific plans for those who prefer them.
Do you monitor uptime, and what do you commit to?
We commit to 99.9% uptime and monitor continuously — not a marketing number but an operational one, with alerting that usually has us fixing issues before customers notice them.
Will you move my existing website for free?
Yes — open a ticket with your current host's access details and we handle the whole move: files, databases, email and configuration, verified by you before DNS switches. The old site keeps serving until the new copy takes over, so visitors never see a gap.
Keep exploring
Parked Domain
A parked domain is a registered domain pointed at your hosting without its own site.
Subdomain
A subdomain is a named subdivision of your domain — blog.example.com, shop.example.com.
CMS Hosting
A fast, secure home for WordPress, Joomla, Drupal and every major CMS.
Joomla Hosting
Joomla-ready hosting with one-click install and free migration in.
Planning to switch hosts? Grab the checklist here.
The steps that keep a site migration dull rather than dramatic: what to back up first, how to shift email across without losing a single message, when to touch DNS, and the two mistakes behind nearly every hour of downtime we come across.
Put an ally behind your website.
Free SSL, free migration, honest renewals and 24/7 human support. That's the whole pitch.
View CMS Hosting plans