Our VPN API allows customers access to a database that provides details on whether an IP address was found to host a known VPN service, proxy service or Tor node. Any is set to true if the IP address has been detected as any type of VPN, proxy or tor exit node. More specific fields exist if you want to filter or check the specific type of proxy or VPN.

curl ipinfo.io/23.24.240.0/vpn?token=$TOKEN
{
  "vpn": {
    "any": true,
    "ipsec": false,
    "openvpn": true,
    "proxy": false,
    "tor": false
  }
}