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FastResolver is another portable NirSoft tool that is quite simple but can also be very useful in some situations. You can either resolve a range of IP addresses or provide a list of IP addresses.
The latter feature can be helpful if your firewall or web server doesn't log domain names because of performance reasons. FastResolver is a multithreaded application, which makes it very quick.
FastResolver can also do the opposite; that is, you can use the tool to resolve IP addresses to host names. This also works if a host has multiple IP addresses. And if an IP address has multiple host names, FastResolver can display those too.
The tool also allows you to quickly retrieve a list of the MAC addresses of the computers in your network, which you can use for Wake-on-LAN or resolve IP address conflicts (for instance). If you copy this text file as oui.txt into the FastResolver folder, you can also see the manufacturer of the networks card.
Selected results can be saved to a text file, and you can display the output in an HTML page. As with most NirSoft tools, FastResolver also works on the command prompt, which can be useful if you have to resolve IP addresses in scripts.