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In order to determine the country a hostname belongs to, its IP address should be determined first. IP address resolution is a relatively time-consuming process (from a few milliseconds up to several seconds) that requires an Internet connection. The multithreaded resolving and DNS cache accelerates this process.
You can specify the number of simultaneous IP resolution threads (when processing multiple queries and batch files that contain hostnames) in the Simultaneous IP address resolving threads field. Note that a large number of simultaneously-started resolving threads may lead to excessive CPU and network utilization. We suggest that you reduce the number of resolving threads if you experience resolving errors.
To use DNS caching, enable the Enable hostname/IP-address caching option. The Maximum number of records field contains the maximum number of hostname/IP address pairs stored in the cache. The current number of records is shown in the Current number of records field.
Click on the View Cache button to view the cache contents. To clear the cache, click Clear Cache. If you enable the Clear cache on exit option, the cache will be cleared when the program is closed.
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