LOLBAS

MAC Address Lookup

MAC Address Vendor Lookup: MAC/OUI/IAB/IEEE Vendor Manufacturer Search

MalAPI.io

MalwareBazaar - Browse

MalwareBazaar - Malware sample exchange

Microsoft Defender Threat Intelligence | Microsoft Security

MITRE ATT&CK®

Netlas.io - discover, research and monitor any assets available online

NVD - Search and Statistics

Onion Search Engine

Open Source Vulnerability Database | Mend

OpenCVE

OpenWiFiMap

OSV

Overcast Security

PHP Code Examples - HotExamples

PolySwarm - Crowdsourced threat detection

Projectdiscovery.io | Chaos

RapidDNS Rapid DNS Information Collection - Home

Reacher - Open-Source Email Verification API

reddit

Reports

Rescure Cyber Threat Intelligence Feeds - Curated cyber threat intelligence for everyone

Reverse Phone Lookup | Phone Number Search | NumLookup

See cached version of website

Snyk Vulnerability Database | Snyk

SSLBL | Detecting malicious SSL connections

SSLBL | Malicious SSL Certificates

Subdomain Finder - C99.nl