To do a reverse look up (IP address to domain name), simply enter the IP address as the domain name, and do a PTR-record look up. The IP address will automatically be converted to an in-addr.arpa domain name.
The IP address or domain name of the DNS server to query can be specified when "DNS Server Selection" is checked in the View Menu.
When "Request Recursion" in the Tools Menu is checked (default), the DNS server will be asked to resolve the query if it doesn't have the answer in cache.
Not all DNS servers accepts requests for recursion (Also an option in the Simple DNS Plus).
If a DNS server does not offer recursion, it will usually still respond to the request, but may only offer references to closer matching DNS servers.
WHOIS
The WHOIS look up function provides detailed information (such as name, address and phone) about the owners of a domain name or IP address.
This is done through special WHOIS servers maintained by the organizations responsible for the top level domains around the world.
Simple DNS Plus comes with a recent list of these servers and will automatically select the best match when the "Auto WHOIS Server" option in the Tool menu is selected (default).
You can add new WHOIS servers to the list by manually editing the "whois.dat" file found in the Simple DNS Plus directory.
If you do a WHOIS lookup for a top level domain not listed in the "whois.dat" file, the lookup tool will try to use the server name "whois.nic." + the last segment of the domain name entered, as this is the most common WHOIS server name.
COM Object
The DNS Look Up window is also a COM object which can be called from any script or application supporting COM objects.
For details on this, please see How to integrate with other applications
