Find geolocation, ISP, and proxy/VPN status for any IP address — or check your own.
If you received a suspicious email, look up the sender's IP to see what country it originated from.
Check if your VPN is working by looking up "My IP" before and after connecting — your location should change.
If you're a sysadmin, identify whether an IP trying to access your systems is a known data center or proxy.
Cross-reference IP addresses in your server logs to understand where your visitors are coming from.