If you cannot find your DOT address on e.g. polkascan.io, it has either not received the minimum amount of DOT required to activate the account yet, or its balance dropped below the minimum of 1 DOT.

This minimum amount, known as the existential deposit (ED) is currently set at 0.001 KSM for the Kusama network and 1 DOT for Polkadot. 

To learn more about the existential deposit (ED) click here.

You can (re-)activate any address by sending the minimum required amount to it. This will make it findable on block explorers again.

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