When a Mastodon server defederates from another server, it blocks all communication between the two instances. This means users on one server can no longer see posts, follow accounts, or interact with users on the blocked server. If you are a user on a server that gets defederated by another server, your followers who are on the defederating server will lose the ability to see your posts in their home timeline. This article explains exactly what happens to your followers during a defederation event, why servers choose to defederate, and what you can do to maintain your audience.
Key Takeaways: Mastodon Defederation and Your Followers
- Defederation blocks all cross-server communication: Followers on the defederating server cannot see your posts or interact with you.
- Your account remains active on your home server: Only the relationship with the defederating server is severed; your profile and posts stay intact.
- Migration is the only way to regain followers: Moving your account to a server not blocked by the defederating instance can restore visibility.
Why Mastodon Servers Defederate and How It Affects Followers
Defederation is a moderation tool used by Mastodon server administrators to block entire other servers. The most common reasons include repeated spam attacks, hate speech, harassment, or failure to enforce the blocking server’s content policies. When Server A defederates from Server B, all communication between the two stops. This includes the exchange of posts, likes, boosts, follows, and direct messages.
For users, the effect is immediate. If you are on Server B and Server A defederates from Server B, your followers on Server A will no longer see your new posts in their feed. They will also not be able to interact with you. However, your existing posts that were already federated to Server A before the defederation may remain visible on Server A for a short time, depending on how the server caches content. Server A will eventually purge cached content from Server B based on its cache retention settings.
What Defederation Does Not Do
Defederation does not delete your account. Your profile, posts, and followers on your home server remain exactly as they were. Only the connection to the defederating server is broken. You can still log in to your account, post new content, and interact with users on other servers that have not blocked your instance.
Steps to Check If Your Followers Are Affected by Defederation
If you suspect a server has defederated from your instance, follow these steps to verify and assess the impact on your followers.
- Check your server’s defederation list
Log in to your Mastodon web interface. Navigate to Preferences > Administration > Federation > Domains. Look for any domain marked as “Suspended” or “Rejected.” A suspended domain means your server has defederated from that domain. If you do not see the domain here, your server may not have defederated from it, but the other server may have defederated from yours. - Search for a post from a user on the suspected server
In the search bar, type the full Mastodon address of a user on the server you suspect has defederated from you. For example,@username@example.com. If you see an error like “No results” or the profile shows no posts, this is a strong indicator that defederation is in effect. - Check if your posts reach followers on the other server
Ask a follower on the suspected server to check their home timeline. If they cannot see your new posts, the defederation is likely active. Alternatively, ask them to search for your profile directly on their server. If they cannot find you, the block is confirmed. - Review your followers list for missing accounts
Go to your profile and click the “Followers” count. Scroll through the list. If you notice that many followers from a specific domain have disappeared, defederation may have caused their accounts to be removed from your follower list on your home server. However, the follower count on your home server may still show them if they were cached before the block.
If Your Followers Are Lost Due to Defederation
Followers on the Defederating Server Cannot See Your New Posts
This is the most common outcome. Your followers on the defederating server are effectively cut off. They will not receive any new posts from you. They also cannot boost, like, or reply to your posts. The only way for them to see your content is to manually visit your profile on your home server, but most users will not do this regularly.
Your Follower Count May Not Update Immediately
Mastodon caches follower relationships. Even after defederation, your follower count on your home server may still show the number of followers you had before the block. Over time, as the cache clears, the count will drop. This can take days or weeks depending on the server’s cache settings.
You Cannot Rebuild the Connection Without Moving Servers
There is no way to re-establish a direct follower relationship with users on a defederated server while you remain on your current instance. The block is server-wide. The only reliable solution is to move your account to a server that is not blocked by the defederating server. This process is called account migration.
Mastodon Account Migration vs Staying on the Blocked Server
| Item | Account Migration | Stay on Current Server |
|---|---|---|
| Follower recovery on defederated server | Possible if new server is not blocked | Impossible |
| Preservation of your old account | Old account remains but is redirected | Account stays fully active |
| Time and effort required | Moderate; requires setting up a new account and initiating migration | None |
| Risk of losing followers on other servers | Low if migration is done correctly | No risk |
If you choose to stay on the blocked server, your followers on the defederating server are permanently lost for new posts. If you migrate, you can regain visibility on that server as long as your new home server is not blocked by it. Migration also lets you bring your existing followers from other servers with you, provided those servers are not blocked by your new instance.
Common Misconceptions About Defederation and Followers
Defederation Does Not Delete Your Account
Some users worry that defederation means their account is deleted. This is false. Your account remains fully functional on your home server. Only the communication channel to the defederating server is cut.
Follower Counts Are Not Immediately Accurate
Because Mastodon caches data, your follower count may show an inflated number for some time after defederation. Do not rely on it as an accurate measure of your active audience. Check the actual list of followers to see which domains are represented.
You Can Still Follow Accounts on the Defederated Server
If your server defederates from another server, you can still follow accounts on the defederated server from your home server. However, those accounts will not be able to see your posts or interact with you. The follow is one-way only.
Defederation is a serious event that can fragment your audience. You can now identify whether a defederation has affected your followers by checking your server’s domain blocks and asking contacts on other servers. If you need to restore visibility to followers on a defederated server, account migration is the only reliable path. Before migrating, always confirm that your target server is not blocked by the instances where your audience resides. Use the Preferences > Account > Move to a different account feature to initiate the migration process safely.