1. Identify the Server's Details: Determine the server's IP address, hostname, domain name, and any authentication method (e.g., HTTPS).

2. Construct the URL:

   • If the server is hosted on a specific domain, use the domain name. For example, if the domain is www.example.com, the URL is http://www.example.com/vpn.
   • If the server is hosted on a specific IP address, use the IP address. For example, http://192.168.1.1/vpn.
   • If the server requires authentication (e.g., HTTPS), include it in the URL. For example, http://192.168.1.1/vpn HTTPS.

3. Consider Context: Ensure the URL reflects the server's context (standalone or hosted) and accounts for any authentication methods.

By following these steps, you can accurately express the URL for any VPN server.