Free Network Tools The IP Geolocation tool will show you the approximate location of your IP address. You can lookup the location of other IP addresses. The free DNS (Domain Name Service) Lookup tool will help you debug DNS related issues like global propagation, domain authority, MX records, security and performance. A free Port Check tool to check if a port is open or closed from multiple locations around the world. This can be used to troubleshoot firewall and security issues. The free website Check tool will analyze your website's security, performance and best practices using state-of-the-art standardized checks. The MAC Vendor tool allows you to search for the hardware vendor of a specific MAC address. This can be useful to get information about the device manufacturer of a device on your network.