When you try to join Mastodon, many instances display a message that registration is closed. This happens because instance administrators often disable open sign-ups to control server load and maintain community quality. This article explains why sign-ups are limited on many instances and lists reliable places where you can still create an account. You will learn how to find open instances and what to consider before choosing one.
Key Takeaways: Finding Open Mastodon Instances
- JoinMastodon.org instance picker: Filters instances by category and shows registration status in real time.
- Instances.social directory: Lists thousands of instances with open sign-up and server statistics.
- Instance owner approval requests: Some closed instances accept new members if you send a polite email to the admin.
Why Most Instances Close Sign-Ups
Mastodon is a decentralized network with thousands of independent servers called instances. Each instance is run by a volunteer or small team who pays for hosting and manages moderation. Open registration can quickly overwhelm a server, causing slow performance or downtime. Instance owners also want to maintain a specific culture or topic focus, such as art, technology, or a geographic region. Closing sign-ups helps them keep the community manageable and spam-free. This is not a flaw in Mastodon; it is a deliberate design that prioritizes quality over quantity.
Moderation Workload
Moderating a server requires time and effort. With open registration, bad actors can create accounts and post spam, harassment, or illegal content. Instance owners close sign-ups to reduce the moderation burden and protect existing members.
Server Resource Limits
Each instance runs on a budget. A single Mastodon server can cost $50 to $200 per month depending on the number of active users. If too many people join, the server may exceed its CPU, memory, or storage limits. Closing registration prevents the server from becoming unusable.
Where to Find Instances with Open Registration
If you cannot sign up on your first choice, use these methods to find an instance that accepts new members.
- Use the JoinMastodon.org directory
Open your browser and go to joinmastodon.org. Click the Servers tab. Select a category such as General, Tech, or Art. The page shows a list of instances with a green Open for registration label. Click the instance name to visit its sign-up page. - Browse Instances.social
Go to instances.social. Click the Registration filter and select Open. The page displays all instances that currently allow new sign-ups. You can sort by user count, language, or topic. Click the instance name to register. - Check instance-specific community pages
Many instances post their registration status on a community page like Mastodon.social/about. Look for a line that says Registration: Open or Closed. If you see Open, click the Join button on that page. - Request an invitation from a closed instance
Some closed instances offer an invitation request form. Look for a link labeled Request an invite or Contact admin. Fill in the form with a short explanation of why you want to join. Instance owners often approve requests from people who share the instance topic or community values. - Search for niche instances on Fedi.Directory
Go to fedi.directory. This site lists Mastodon instances by interest, such as photography, writing, or gaming. Each listing includes the registration status. Click the instance link to sign up if it shows Open.
Common Issues When Finding an Open Instance
All Popular Instances Are Closed
Large general-purpose instances like mastodon.social and mastodon.online often close registration due to high demand. Do not wait for them to reopen. Instead, choose a smaller instance that matches your interests. Smaller servers usually have open sign-ups and offer a more focused community.
The Instance Is in a Different Language
You may find an open instance where the interface language is not English. Most Mastodon instances let you change the interface language in Preferences > Appearance > Language. The posts you see in the federated timeline may still be in the local language, but you can follow accounts from any instance regardless of language.
The Instance Has a Low User Count
An instance with 10 or 20 active users is not a problem. Mastodon is fully federated, meaning you can follow and interact with users on any other instance. You do not need thousands of users on your own server to have a good experience.
Open vs Closed Instances: Key Differences
| Item | Open Instance | Closed Instance |
|---|---|---|
| Registration process | Click Join and fill in your details | Must request an invitation or wait for an admin to approve |
| Server load | Can be higher due to constant new members | Lower and more predictable |
| Moderation difficulty | Higher because of unknown new users | Lower because the admin can vet applicants |
| Community focus | Often general-purpose | Often niche or topic-specific |
| Spam risk | Higher without strong moderation | Lower due to controlled access |
After choosing an open instance, you can create your account and immediately start following people across the entire Mastodon network. If you later find a better instance, you can migrate your followers using Preferences > Account > Move from a different account. This feature transfers your followers without losing your posts. Start by joining any open instance that matches your interests, then explore the network freely.