Whoisfreaks
WhoisFreaks provides Live and Historical domain records through downloadable WHOIS Database and WHOIS APIs in REST JSON and XML format.
DNS & DDOS
DNS Lookup
Find all DNS records for a domain name with this online tool. Nslookup shows A, AAAA, CNAME, TXT, MX, SPF, NS, SOA and more.
SecurityTrails
SecurityTrails enables you to explore complete current and historical data for any internet assets. IP & DNS history, domain, SSL and Open Port intelligence made easy
Project Shield
Protecting free expression from digital attacks. Project Shield is a free service that defends news, human rights, and elections-related sites from DDoS attacks.
GeekFlare
A set of free tools to test your site for DNS, Security, Performance, Network and SEO issues.