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how to design a protocol to help 1000 PCs know whether online or not

(Sorry, I know this is not suitable place to post this question. If you know where I should post, pls let me know.)
There are 1000 PCs, each know these 1000 PC's IP address, each is equal. How to design a protocol for every PC to find out the other PCs are still online? Thank you!!!

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