With this tool, you can check the availability of multiple domains at once. Just enter one domain per line and click the button to check. Maximum 30 domains at a time.
Some prominent and well-known domain registrars are suspected of registering the domains you search for through them and then selling them back to you at a higher price. That's a rather unscrupulous act. To avoid such risks, it's better to check domain availability using this little indie tool.