DomainTools – is the famous website whois.sc with a new name and a lot of added domain searching functionality. Domain Tools provides all the tools you could possibly need when it comes to domain names and their registration. It provides detailed uptime reports on providers, whois history database, and more.

DnsStuff – is a web application that empowers users with tools and expertise to test, resolve and configure their DNS and Network. Includes standard DNS lookups, WHOIS/IPWHOIS, and even obscure DNS hosting tests, IPv6, IP-to-country and spam database lookups.

OpenDNS – provides static DNS services as well as many advanced services such as Dynamic DNS resolution, Secondary service, AXFR service, and domain2web redirection. Of course, our primary service is free DNS. OpenDNS provides you with the tools to see what’s happening on your network, coupled with the tools to take action. For example, discover that myspace.com is the most frequently visited site on your network, and then block it with a single click.

DynDNS – provides domain name system services with the highest levels of redundancy, service, and support in the industry.

EveryDNS – provides free DNS and backup MX services. This includes Static DNS, Dynamic DNS and URL Redirection.