Hash Lookup API for MD5, SHA1, SHA256, SHA512 & NTLM

Free public API access is available today for authorized research workflows, and a premium version is planned for teams that need faster high-volume pentest operations.

Lookup Overview MD5 Lookup SHA1 Lookup NTLM Lookup SHA256 Lookup SHA512 Lookup JWT Checker JWT Security Testing
AlgorithmsMD5, SHA1, NTLM, SHA256, SHA512
Coverage30B lines in each algorithm database
Rate Limit1 request/second per IP
Rate Limit: 1 request per second per IP address. All requests must include proper headers.

Endpoint Reference

POST /api/v1/lookup

Each supported format has its own prepared 30B-line database.

Request Body

{ "hash": "5f4dcc3b5aa765d61d8327deb882cf99", "alg": "md5" }

Response

{ "found": true, "plaintext": "password", "elapsed_ms": 42, "alg": "md5" }

Supported Algorithms

md5 sha1 ntlm sha256 sha512

Authentication

Currently no authentication is required for public research use. Rate limiting is enforced per IP address, and a premium API tier is planned for larger pentest workflows.

Example Usage

curl -X POST "https://crackcrypt.com/api/v1/lookup" -H "Content-Type: application/json" -d '{"hash":"5f4dcc3b5aa765d61d8327deb882cf99","alg":"md5"}'

API Testing Terminal

Ready to start lookup...