How to know if Proxies are shared or not?

I have private proxies. Not shared private proxies.

I am the only one using it and only use it for social media. But google today say that I have unusual activities on some of my proxies. I believe that someone else are using them too. It never said that before.

How can I know if my private proxies are shared or not. I don't think the seller will tell me the truth.

It's possible that there is another user on the same subnet; Google is now temporarily captcha-limiting and banning entire IP ranges.

Check the speed of the proxy if it's higher than 1000kbps then it must be a private proxy meanwhile if you have done nothing (for example things like Google scraping or fast repeated manual searches) then it may be due to the fact it's a shared proxy.

skyflash said:

Check the speed of the proxy if it's higher than 1000kbps then it must be a private proxy meanwhile if you have done nothing (for example things like Google scraping or fast repeated manual searches) then it may be due to the fact it's a shared proxy.

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That is serious nonsense advice. A proxy could easily much more speed than that and still be shared. It has literally nothing to do with being shared/private.
The speed of a proxy is determined by server load and the network. A private proxy on the same server will most likely be just as fast as a shared one.