How can I find out if there is a proxy between myself and the Internet if there are no proxy setting specified in the browser?

If you have a transparent proxy, IP detection sites will not be able to tell in case there's a proxy sitting in-between.

Instead, you can do the following:

• Check your external IP using a site like What Is My IP.

• Run ipconfig /all, if you're connected without a router:

• Check your router IP, if you're connected through a router:

If your local/router IP does NOT match the IP on the "What Is My IP" site, then you have a proxy in-between.

If it's a transparent proxy, you won't be able to detect it on the client PC.