Online 'cracking'
ntlm.pw
This website offers a NTLM to plaintext password "cracking" service, using a custom high performance database with billions of precomputed password hashes. It by no means cover anything near the possible combinations, but will probably give you way more results than it should on a regular Active Directory dump.
Crackstation
CrackStation uses massive pre-computed lookup tables to crack password hashes. These tables store a mapping between the hash of a password, and the correct password for that hash. The hash values are indexed so that it is possible to quickly search the database for a given hash. If the hash is present in the database, the password can be recovered in a fraction of a second. This only works for "unsalted" hashes.
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