Detecting a VPN IP address can be tricky. However, there are several ways to find out if a person is using a VPN. The first is to check if the IP address matches one of the known VPNs. A public list of known VPNs can be used to do this.
How to find VPN IP address?
Another method is to use DNS leaks. Ideally, a DNS leaker should not use DNS servers provided by a domain registrar. Instead, the leaker must have their own DNS servers.
Other methods include packet capturing and using a web service. These tools are usually free and can give you an idea of how a person uses their detect VPN IP address. Some of these methods also allow you to see what the source and destination ports are for the VPN. You can even cross-reference data to help you get a better sense of where the user is in relation to the rest of the world.
If you are looking for a more advanced tool, you can try Wireshark. This is a more sophisticated way to check whether a VPN is being used. It can also show you the patterns of traffic.
Another method is to use a hostname. Some VPNs use the same hostnames as websites. When a website is visited, the IP address is checked to see if it matches a known VPN.
Some websites may ban you if they believe you’re using a VPN. You can also search the whois database to see if a person’s IP is listed as belonging to a VPN.