Domainr - Domainr
DNSdumpster.com - Open source domain intelligence lookups for security recon
Instant Domain Search - Search domain names instantly by showing results as you type.
ViewDNS.info - Free DNS related tools including Reverse IP Lookup, DNS Propagation Checker, Chinese Firewall Test...
GoDaddy - GoDaddy makes registering Domain Names fast, simple, and affordable. Find out why so many business owners chose GoDaddy to be their Domain Name Registrar.
DNS Checker Tool - Check Domain Name System (DNS) records for any website.