This online tool provides important dns information about domains.
Much useful information is provided. For example: If you want to know
Google's DNS information, just enter "google.com" (without the quotation
marks) in the textbox at the top of this page and press the submit button.
Here is a short list of some of the details provided:
IP Whois: Essential information about your IP address.
Domain Whois: Important information about any existing domain with any suffix.
DNS Lookup: The ultimate DNS lookup tool, retrieve any domain's DNS records.
Ping: Check any server to see if it responds to ping requests.
Head Info: Retrieve the head infrmation from any webpage.
Test Port: Test for open ports on your side.
Trace Route: Run a trace route to see the path to a server.