Mastodon username checker for mastodon.social
Mastodon is a decentralised social network, and mastodon.social is its largest server. This Mastodon username checker uses the server's public lookup to see if @yourname is already taken there.
Mastodon usernames use letters, numbers and underscores, up to 30 characters. Because each server has its own usernames, a name taken on mastodon.social might still be free elsewhere. You also can't rename an account on the same server, so choose carefully.
Many people post on Mastodon, Bluesky and X at once. Each search here checks all the major platforms together, so you can keep your handle consistent.