URLhaus

Database of malicious URLs used for malware distribution

Official docs outline

Extra Credit builds an outline of URLhaus's docs the first time your work uses it. Until then, start at the official documentation.

SecurityTrails Domain and IP related information such as current and historical WHOIS and DNS records
Shodan Search engine for Internet connected devices
Spyse Access data on all Internet assets and build powerful attack surface management applications
SSL Domain Health Check SSL certificate validity, domain WHOIS status, and DNS record checks for any domain
SSL Labs Deep SSL/TLS server analysis with A+ to F grading
Tanod Pay-per-call scans of smart contracts, addresses and MCP/skill packages; small free daily tier
Threat Jammer Risk scoring service from curated threat intelligence data
ThreatCluster Threat intelligence: incident clusters, validated IOCs, CVEs, ransomware leak-site victims
UK Police UK Police data
Virushee Virushee file/data scanning
VPNDetection Check whether an IPv4 or IPv6 address belongs to VPN infrastructure, no key needed
VulDB VulDB API allows to initiate queries for one or more items along with transactional bots