The Tor Project maintains a community-driven database tracking which Internet Service Providers support or restrict Tor relays and exit nodes. M247 Europe, OVH SAS, Online S.A.S., Hetzner Online GmbH, IONOS SE, netcup GmbH, and 1337 Services GmbH are specifically flagged as hosting many existing Tor nodes, suggesting users avoid them for network diversity.

For exit relays, the guidelines emphasize checking Terms of Service and Acceptable Use Policies first, as policies frequently change. Linode explicitly allows exit nodes with reduced exit policies, while OVH Kimsufi strictly forbids them. Some providers like MAXKO Hosting in Croatia actively support Tor exit relays with unmetered bandwidth and cryptocurrency payment options, offering 10% off with coupon TOR10.

Geographic distribution matters for anonymity - the database tracks consensus weight by country and ISP. TeliaSonera Finland and M247 Europe show minimal usage, while netcup GmbH in Germany shows 4.19% consensus weight. The resource helps operators find Tor-friendly hosts and avoid networks already saturated with relays.