Best Answer
I like Pingability. http://pingability.com/index.jspThey sell monitoring services but they also have a free instant check that you can use to
check DNS, SMPT and POP3/IMAP servers. Look for the link: "Instant Checks" right below their logo.
Response by: kwd155 points |
You can check by "dig" or "nslookup" command.
Response by: jalal3623 points |
There's also http://www.dnscog.com/ which is provided by the same people at offer DynDNS.
There's takes a little longer to process but can offer more detail and information to help
diagnosis.
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