http://walletdvl5avrmoxk2fwsf5b76zkmbkoo3r6kqeesq5hsgnq7xhbciad.onion/check-bitcoin-address-in-leaked-bitcoin-private-keys-database
Generated base with parts of whole range, collected from GitHub, forums and sites. Also we generated brain wallet addresses and vanity addresses. All private keys are totally free. But we did not recomendate to take used keys.