What is hash lookup?
Hash lookup compares a hash against a prepared dataset to check whether a known plaintext value exists for that hash.
Hash Lookup
Hash Lookup for MD5 SHA1 SHA256 SHA512 and NTLM
Use this page to understand hash lookup flow, what inputs are accepted, and how to use CrackCrypt for authorized testing and recovery tasks.
Primary use: Find known plaintext matches for MD5, SHA1, SHA256, SHA512, and NTLM hashes during legitimate security work.
How to run this workflow
- Open the main lookup tool and choose the hash algorithm.
- Paste one hash value in hexadecimal format and confirm authorization.
- Review the result and move to API mode if you need automation.
Common questions
When should I use hash lookup instead of brute force?
Use lookup first for speed. If no match exists, move to controlled offline cracking workflows that you are allowed to run.
Which formats are accepted?
CrackCrypt lookup supports MD5, SHA1, SHA256, SHA512, and NTLM hexadecimal hashes.
Trust and policy
CrackCrypt supports authorized security testing and account recovery workflows.
Lookup coverage currently includes MD5, SHA1, NTLM, SHA256, and SHA512 with dedicated high-speed databases for each supported format.
We build these prepared datasets to help security researchers save time and storage instead of maintaining huge local collections. Free public access is available today, and a premium version is planned for pentest teams that need faster workflows.
Last updated .
Review legal terms on the service terms page before using lookup or JWT testing features.
Contact: [email protected]
Related guides
Site coverage
CrackCrypt includes hash lookup, API lookup integration, JWT checking, and JWT security testing pages across MD5, SHA1, NTLM, SHA256, and SHA512 workflows.
Use the main tool for live checks and use these focused pages when you need detailed guidance for reports and remediation plans across research, incident response, and pentest workflows.