ViewDNS.info - Free DNS related tools including Reverse IP Lookup, DNS Propagation Checker, Chinese Firewall Test...
Whats My DNS - Instantly check your domain names current IP address and DNS record information against multiple name servers located in different parts of the world.
NsLookup.io - A simple and powerful tool for querying DNS records
CubDomain - CubDomain.com is the site to check website's statistics, Information, Whois Record, Hosting...
DNSChecker.org - 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.
Domains Index - Lists of all registered domains, registered domains database, bulk WHOIS database.