The antichrist is referred to as "the Beast":

"The the beast was allowed to speak great blasphemies against God. And he was given authority to do whatever he wanted for 42 months. And he spoke terrible words of blasphemy against God, slandering his name and his dwelling, that is, those who dwell in heaven. And the beast was allowed to wage war against God's holy people and to conquer them. And he was given authority to rule over every tribe and people and language and nation. And all the people who belong to this world worshiped the beast. They are the ones whose names were not written in the Book of Life -the Book that belongs to the Lamb who was slaughtered before the world was made ."

The NIV version of the Bible is clearer that a time of rebellion will come before Christ's return and then the 'man of lawlessness, the man doomed to destruction' will be revealed.

The Antichrist eventually will exalt himself above God to be worshiped in the Lord's Temple, proclaiming he is God.  He will do counterfeit miracles, signs and wonders, to get a following and deceive many.

Paul, like John, also warns believers about the antichrist's ability to deceive; "Let no one deceive you by any means; for that Day will not come unless the falling away comes first and the man of sin is revealed, the son of perdition, who opposes and exalt himself about all that is called God or that is worshiped, so that he sits as God in the temple of God, showing himself that he is God."

By the end times, many will be easily deceived and will gladly accept the antichrist because his spirit will already be living all around the world.

In 2 Thessalonians 2:3-4, the antichrist is call the 'man of sin' or 'son of perdition'.

1 John 4:13 says, "Beloved, do not believe every spirit, but test the spirits, whether they are of God; because many false prophets have gone out into the world. By this you know the Spirit of God; every spirit that confesses that Jesus Christ has come in the flesh is of God and every spirit that does not confess that Jesus Christ has come in the flesh is not of God. And this is the spirit of the Antichrist, which you have heard was coming and is now already in the world."

The name 'antichrist' is only found in 1 John 2:18, 2:22, 4:3 and 2 John 7. 

John, the apostle of Jesus, was the only writer of the Bible to use the  name antichrist.

Many antichrists/false teachers will appear between the times of Christ's first coming and His second coming; but there will be one great antichrist who will rise to power during the end times/last hour. He will be a liar and a deceiver.

He saith -- who is testifying these things -- `Yes, I come quickly!' Amen! Yes, be coming, Lord Jesus!

The grace of our Lord Jesus Christ [is] with you all. Amen.

And if any one may take away from the words of the scroll of this prophecy, God shall take away his part from the scroll of the life, and out of the holy city, and the things that have been written in this scroll;

For I testify to every one hearing the words of the prophecy of this scroll, if any one may add unto these, God shall add to him the plagues that have been written in this scroll,

And the Spirit and the Bride say, Come; and he who is hearing -- let him say, Come; and he who is thirsting -- let him come; and he who is willing -- let him take the water of life freely.

I, Jesus did send my messenger to testify to you these things concerning the assemblies; I am the root and the offspring of David, the bright and morning star!

Happy are those doing His commands that the authority shall be theirs unto the tree of the life, and by the gates they may enter into the city; and without [are] the dogs, and the sorcerers, and the whoremongers, and the murderers, and the idolaters, and every one who is loving and is doing a lie.

And lo, I come quickly, and my reward [is] with me, to render to each as his work shall be;I am the Alpha and the Omega -- the Beginning and End -- the First and the Last.

he who is unrighteous -- let him be unrighteous still, and he who is filthy -- let him be filthy still, and he who is righteous -- let him be declared righteous still, and he who is sanctified -- let him be sanctified still:

And he saith to me, `Thou mayest not seal the words of the prophecy of this scroll, because the time is nigh;

And I, John, am he who is seeing these things and hearing, and when I heard and beheld, I fell down to bow before the feet of the messenger who is shewing me these things; and he saith to me, `See -- not; for fellow-servant of thee am I, and of thy brethren the prophets, and of those keeping the words of this scroll; before God bow.'