intodns checks the health and configuration of dns and mail servers.

WhoisFreaks provides Live and Historical domain records through downloadable WHOIS Database and WHOIS APIs in REST JSON and XML format.

Check DNS Propagation worldwide. DNS Checker provides name server propagation check instantly. Changed nameservers so do a DNS lookup and check if DNS and nameservers have propagated.

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

Find all DNS records for a domain name with this online tool. Nslookup shows A, AAAA, CNAME, TXT, MX, SPF, NS, SOA and more.

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whois api lets you quickly lookup a domain name's whois data. you get fully parsed whois fields in xml or json format at just $2 per 1000 domains!

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