How can you tell if someone has a VPN?
No unencrypted packets If the Observer sees only encrypted packets and no unencrypted packets, it may be that a VPN is being used. While the world is rapidly moving towards encrypting as much data on the network as possible, there are still requests that are typically not encrypted.
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Can you tell if IP is VPN?
The IP addresses of VPN servers are not difficult to recognize – there are even databases specialized in VPN detection that try to determine if an IP address belongs to a particular provider. When you access a VPN-enabled website, it may be able to identify that you’re using a VPN based on your IP address.