DNSstuff alternatives

In the past I used DNSstuff heavily, but since it went commercial I have tried to find useful free alternatives.

I gathered this brief set of links and saved is a draft long ago, which I now have remembered to publish:

• http://network-tools.com/
• http://dnsutils.com/
• http://www.robtex.com/
• http://clez.net/
• http://serversniff.net/
• http://w3dt.net/
• http://www.intodns.com/