
Maltiverse – Maltiverse (can search for IPs and URLs and will indicate if it is malicious or not).Cybercrime Tracker – CyberCrime (can search for a particular URL to see if it is connected with malicious activity).ThreatCrowd – Threat Crowd | Open Source Threat Intelligence (a search engine for threats, can look up domains, IPs, Emails or Organizations).VirusTotal – VirusTotal (a site to check the reputation of URLs and IPs as well as upload files to and see if they are detected by the Anti-Virus programs remember this is a public site so any files that are uploaded can be seen by anyone).

AbuseIPDB – AbuseIPDB – IP address abuse reports – Making the Internet safer, one IP at a time (gives a confidence report on if a particular IP is malicious or not and what the public has seen that IP doing such as SSH brute force).Sites to Check Indicators of Compromise (IOC) AlienVault OTX – AlienVault – Open Threat Exchange.
#Alienvault otx ip lookup for free
Recorded Future – Use Recorded Future for Free | Recorded Future (this link is not a platform but is a daily free threat intelligence email).Mandiant Advantage – Threat Intelligence Platform | Threat Intelligence Tools | Mandiant.RiskIQ – RiskIQ | Digital Risk | Cyber Threat Intelligence | Incident Response.All of these platforms you will have to register for, but are worth it.

They are still great to be able to look up IOCs (indicators of compromise) on threat actors. All threat of these platforms are free, but not all of the functions are available for the free versions.
