Look up a domain in DNS
Query the Domain Name System (DNS) to translate a domain name into an IP address
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DomainTools Whois
Find out about a domain, including who owns it and their contact information, what server software it runs, usage ranking among many other useful information bits -
Robtex Domain/IP Lookup
Get detailed information about an Internet host. Enter an IP address (64.233.167.99), domain name (google.com), hostname (py-in-f99.google.com), or AS-number (AS15169) to get detailed dns information including reverse dns and forwards, whois information, who hosts the machine, and if it's listed in any RBLs (black lists). -
Wolfram|Alpha
Enter a question or calculation and Wolfram|Alpha uses its built-in algorithms and data to get the answer. A huge set of information and tons of models, methods, and algorithms that make it possible to compute whatever can be computed about anything -
Geektools Dig DNS
Query DNS domain name servers for information about host addresses, mail exchanges, name servers, and related information