Bulk Hash Reputation
at Scale
Instantly check MD5, SHA-1, and SHA-256 hashes against the NIST National Software Reference Library — one at a time or up to 10 at once, free.
Intelligence sources
Backed by NIST NSRL — 1.5 billion known files
The National Software Reference Library is the U.S. government’s authoritative catalog of known-good file hashes, covering over 1.5 billion file records from thousands of software publishers. A match means instant, confident clearance.
1.5B+ file records · maintained by NIST · updated quarterly
Sample output
Clear verdicts, instantly
Hash type is detected automatically. A Known/Found result means the file is recognized by NIST NSRL; Unknown means it isn’t — and may warrant further review.
| Hash | Type | Source | Status | Details |
|---|---|---|---|---|
| d41d8cd98f00b204e9800998ecf8427e | MD5 | NSRL | ✓ Found | Known Windows system file |
| da39a3ee5e6b4b0d3255bfef95601890afd80709 | SHA-1 | NSRL | ✓ Found | Recognized software component |
| e3b0c44298fc1c149afbf4c8996fb924… | SHA-256 | NSRL | ? Not Found | Not in NSRL — warrants further review |
Why bulk matters
One-at-a-time is too slow for real work
Seconds, not hours
Submit multiple hashes of different types in a single API call. Incident response timelines can’t wait for copy-paste loops.
Context at scale
Cross-reference entire disk images, memory dumps, or EDR artefact lists in one operation.
Plugs into your workflow
Pipe results into your SIEM, SOAR, or case management tool via the REST API. No manual copy-paste.
Start checking hashes in seconds
2500 free lookups / month. No credit card needed.