How is a person identified on IRC? Can it be changed so that you are "fresh" again, and unknown?

Is it by IP adress or something else? For example, if I log into a chat, then come back a few months later, how can I still be identified as the same

Is it by IP adress or something else? For example, if I log into a chat, then come back a few months later, how can I still be identified as the same person?

or:Is it by IP adress or something else? For example, if I log into a chat, then come back a few months later, how can I still be identified as the same person?

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