ISP versus IP. In your question, you say that you’re “using an ISP-changer program.” I think you mean an IP-hiding service or proxy. It’s your Internet Protocol (IP) address that’s being “changed” (hidden), not your Internet Service Provider (ISP).The IP address is the number that identifies one end of a connection on the internet.ow, what your local ISP can see depends on what you’re doing and which technique you’re using. First, they can always tell that you’re connecting to one of these proxying or anonymization services. If it’s a simple proxy, they may be able to see what you’re transmitting.