General Reputation

VirusTotal Online service to analyze files, URLs, IPs, enabling the detection of malware against antivirus engines
WHOIS Lookup WHOIS lookup
Talos Threat Intelligence Cisco’s threat intelligence platform for IP and domain reputation
AlienVault AT&T Cybersecurity threat intelligence platform for IP and domain reputation

IP Reputation

IPVoid IP Reputation Database
AbuseIPDB IP Abuse and Reputation Database

Domain Reputation

URLScan.ioURL Sandbox
App.Any.RunURL Sandbox
Pulse Dive URL sandbox and behavior
Spamhaus URL reputation database
URLQuery Web based malware database
URLVoid URL reputation database
Phishcheck URL sandbox and phishing database
SecurityTrails World’s Largest Repository of historical DNS data
Gandi It all begins with a domain name.
Whoisology More Than Reverse Whois Lookups

Email Reputation

MX Tool Box – Header Email header analysis
MX Tool Box – Super Tool General email analysis