Helps to know geolocation data of IP address or hostname: country, region, city, ZIP/postal code, time zone, local time, IP range, ISP, organization.
Allows to test the reachability of a host, to measure network latency and packets loss from different servers in the world.
BGP Lookup shows how data is routed between networks, helping with traffic analysis and troubleshooting.(Just IPv4/IPv6)
Traceroute shows the path data takes across the internet, helping identify delays or issues along the route.(Just IPv4/IPv6)