If you want to host multiple websites from a single WordPress installation, WordPress Multisite is a powerful solution. Using the subdomain option allows you to create websites such as shop.example.com, blog.example.com, or support.example.com while managing them all from one WordPress dashboard.
This guide explains how to configure WordPress Multisite with subdomains on IONOS hosting, including DNS, SSL certificates, and common troubleshooting tips.
What Is WordPress Multisite?
WordPress Multisite is a built-in feature that allows you to create and manage multiple websites using a single WordPress installation. Each website can have its own administrators, themes, plugins, and content while sharing the same core WordPress files.
Using subdomains, your network might look like this:
- blog.example.com
- shop.example.com
- support.example.com
- news.example.com
This setup is ideal for businesses, franchises, schools, publications, and organizations managing multiple websites.
Step 1: Install WordPress
Install a fresh copy of WordPress or convert an existing installation into a Multisite network.
Before enabling Multisite:
- Update WordPress to the latest version.
- Disable all plugins temporarily.
- Create a full backup of your website and database.
Step 2: Enable WordPress Multisite
Add the following line to your wp-config.php file above the “That’s all, stop editing!” comment:
define('WP_ALLOW_MULTISITE', true);
Log back into WordPress and navigate to:
Tools → Network Setup
Choose Subdomains as your network structure.
WordPress will generate additional code that must be added to your wp-config.php and .htaccess files.
Step 3: Configure DNS and Subdomains
Each subdomain must point to your WordPress installation.
Some hosting providers support wildcard subdomains (*.example.com), allowing every new site to work automatically.
If your hosting provider does not support wildcard subdomains, you’ll need to manually create each subdomain as you add new websites to your Multisite network.
For example:
- collectibles.example.com
- shop.example.com
- events.example.com
Each subdomain should point to the same document root as your primary WordPress installation.
Step 4: Install an SSL Certificate
Every website in your Multisite network should be secured with HTTPS.
The easiest solution is to install a wildcard SSL certificate that protects both your primary domain and all first-level subdomains.
A wildcard SSL certificate covers domains such as:
- example.com
- blog.example.com
- shop.example.com
- news.example.com
Without a wildcard certificate, you may need separate SSL certificates for each subdomain depending on your hosting provider.
Step 5: Create New Sites
Once your network is configured, create additional websites by navigating to:
Network Admin → Sites → Add New
Enter:
- Site Address
- Site Title
- Administrator Email
WordPress will create the new website within your network.
Common Issues
Server Not Found
If visiting a newly created subdomain results in a “Server Not Found” error, the subdomain likely has not been configured in your hosting account or DNS.
Verify that the subdomain exists and points to your WordPress installation.
SSL Certificate Errors
If HTTPS doesn’t work on a new subdomain, confirm that your SSL certificate covers the subdomain or that a wildcard certificate has been assigned.
404 Errors
If pages display 404 errors after enabling Multisite:
- Save your Permalink settings again.
- Verify the
.htaccessrules generated by WordPress. - Clear your website and browser cache.
Redirect Loops
Redirect loops usually occur when:
- WordPress URLs are incorrect.
- HTTPS is improperly configured.
- SSL certificates are missing or misconfigured.
Verify that every site in the network uses the correct HTTPS URL.
Benefits of WordPress Multisite
Using WordPress Multisite provides several advantages:
- Manage multiple websites from one dashboard.
- Share plugins and themes across all sites.
- Reduce maintenance time.
- Simplify updates and security management.
- Easily add new websites as your organization grows.
Final Thoughts
WordPress Multisite is an excellent solution for organizations that need multiple websites under one administration panel. When combined with properly configured subdomains, DNS records, and a wildcard SSL certificate, Multisite makes it easy to expand your online presence while keeping management centralized.
Before launching new sites, always verify that your DNS, SSL certificate, and WordPress network settings are correctly configured to ensure visitors can securely access every website in your network.