Strong's numbers

ἀντίχριστος (G500)

antíchristos

an-tee'-khris-tos

from ἀντί and Χριστός; an opponent of the Messiah:--antichrist.

Abbott–Smith

*† ἀντί-χριστος, -ον, ὁ,

Antichrist, "one who assuming the guise of Christ opposes Christ" (Westc., Epp. Jo., 70): I Jo 2:18, 22 4:3, II Jo 7; pl. I Jo 2:18 (cf. ψευδόχριστος, and v. MM, VGT, s.v.).†

From G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), in the public domain.

4 occurrences

Shown in the King James Version (KJV), whichever translation you read in — it is the text these numbers are tagged against.

1 John 2:18
Little children, it is the last time: and as ye have heard that antichrist shall come, even now are there many antichrists; whereby we know that it is the last time.
1 John 2:22
Who is a liar but he that denieth that Jesus is the Christ? He is antichrist, that denieth the Father and the Son.
1 John 4:3
And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that spirit of antichrist, whereof ye have heard that it should come; and even now already is it in the world.
2 John 1:7
For many deceivers are entered into the world, who confess not that Jesus Christ is come in the flesh. This is a deceiver and an antichrist.