1) Is the Antichrist alive today? I do not know and do not think anyone knows. All speculation on that point is useless. Until he is revealed, no one will have any idea who he is.
2) If he is alive today, does he know that he is the Antichrist? No, probably not. If he is alive today, he is simply a man of the world—arrogant, ambitious, ruthless, calculating, and yet witty and personable, possessed of a dazzling personality that charms and disarms his harshest critics. His “career” as Antichrist will begin when Satan possesses him in a final attempt to overthrow God.
See Who Is the Antichrist?