http://airvpn3epnw2fnsbx5x2ppzjs6vxtdarldas7wjyqvhscj7x43fxylqd.onion/tags/ipleak.net
It's generally used to check if there are leaks (IP, DNS, RTC etc.) with a connection to a VPN, Tor, proxy etc.
We developed it with updated state-of-the-art techniques to detect leaks.
The main page performs around 30 DNS detection tests to build a list. A single detection can be done with:
https://random_long_hash.ipleak.net/
Replace random_long_hash with a random hash on every request.