diff --git a/mastodon/management/commands/check_sites.py b/mastodon/management/commands/check_sites.py
new file mode 100644
index 00000000..4a074bd8
--- /dev/null
+++ b/mastodon/management/commands/check_sites.py
@@ -0,0 +1,42 @@
+import pprint
+from datetime import timedelta
+
+from django.core.management.base import BaseCommand
+from django.utils import timezone
+from loguru import logger
+
+from mastodon.api import detect_server_info
+from mastodon.models import MastodonApplication
+
+
+class Command(BaseCommand):
+    help = "Check mastodon sites' status and disable unreachable sites."
+
+    max_unreachable_days = 31
+
+    def handle(self, *args, **options):
+        logger.info("Mastodon Site Check start.")
+        count_checked = 0
+        count_unreachable = 0
+        count_disabled = 0
+        for site in MastodonApplication.objects.exclude(disabled=True):
+            domain = None
+            count_checked += 1
+            try:
+                domain, api_domain, v = detect_server_info(site.domain_name)
+                site.last_reachable_date = timezone.now()
+            except:
+                logger.warning(f"Failed to detect server info for {site.domain_name}")
+                count_unreachable += 1
+                if site.last_reachable_date is None:
+                    site.last_reachable_date = timezone.now() - timedelta(days=1)
+                if timezone.now() > site.last_reachable_date + timedelta(
+                    days=self.max_unreachable_days
+                ):
+                    site.disabled = True
+                    count_disabled += 1
+            finally:
+                site.save(update_fields=["last_reachable_date", "disabled"])
+        logger.info(
+            f"Mastodon Site Check finished, {count_checked} checked, {count_unreachable} unreachable, {count_disabled} disabled."
+        )