Every time an IP address to hostname resolution is needed, the DNS server is queried. This can be an extra overhead on the program, the network and the DNS server, especially if you receive lots of messages.
To reduce the DNS traffic and resolution time, a DNS cache is used. Once a hostname has been resolved the result is stored locally. The next time that address needs to be resolved, the result is taken from the cache instead of making another DNS request.
In freeware mode, the local DNS cache holds a maximum of 100 entries. The registered version can hold up to 20,000 entries.
This dumps all the current cache entries into a file and then views the file with notepad. Information about the cache performance is also displayed.
Counts the number of valid entries currently in the cache.
This will clear all the dynamic (learned from DNS lookups) entries. It won't clear the static entries that have been loaded from file.
Clear All button:
This will clear the entire DNS cache of all the entries (static and dynamic). A program restart is required to re-read the static entry file again.