How many Mastodon instances are there? How many active users are there? Depends on where you look and how you count.

Quick sanity check across datasources...

vmcrawl :vmstio:
Instances: 9,226
MAU: 787,574

joinmastodon.org :mastodon:
Instances: 7,952
MAU: 780,355

FediDB :fedi:
Instances: 9,193
MAU: 1,037,321

(Based on 20 Feb 2026 API data for all sources)

The world, may never know.