Check IOC is a security research tool that provides rich metadata, passive DNS and aggregated threat intelligence on IPs and domains. Check IOC also shows exclusive threat intelligence data provided by ThreatSTOP on over 24 million known malicious indicators from our database. Using Check IOC, you can search IPs and domains to vet their maliciousness, get more information on suspicious IOCs, or even upload your logs to see if threat actors are communicating with your network.

We are glad to announce that we have just launched a new and upgraded Check IOC tool! Features that were previously reserved for our Premium Portal and API users now have been added to the free version. The new Check IOC also sports an updated interface, smoother UX, and a more generous limit of 25 free lookups a day.

These cool new capabilities were recently added to Check IOC:

  • New previously paid features are now unlocked for our free users  

  • See premium info like Confidence and Risk scores, Tags, and Historical info

  • Free IP and Domain lookups have been increased to 25 per day

  • Hot Lists like Worst IPs and Most Researched IOC's have been added

    Try Check IOC


Want to see how Check IOC works? View our short and sweet how-to video.



Interested in a full Check IOC subscription with unlimited searches and access to our API? Check out our subscription options or sign up for a ThreatSTOP account get a free trial.