The ten horns you saw are ten kings who have not yet received a kingdom, but will receive one hour of authority as kings, along with the beast.

Daniel 7:24
And the ten horns are ten kings who will rise from this kingdom. After them another king, different from the earlier ones, will rise and subdue three kings.

Revelation 10:11
And they told me, "You must prophesy again about many peoples and nations and tongues and kings."

Revelation 12:3
Then another sign appeared in heaven: a huge red dragon with seven heads, ten horns, and seven royal crowns on his heads.

Revelation 13:1
Then I saw a beast with ten horns and seven heads rising out of the sea. There were ten royal crowns on its horns and blasphemous names on its heads.

Revelation 17:16
And the ten horns and the beast that you saw will hate the prostitute. They will leave her desolate and naked, and will eat her flesh and burn her with fire.

Revelation 18:10
In fear of her torment, they will stand at a distance and cry out: "Woe, woe to the great city, the mighty city of Babylon! For in a single hour your judgment has come."

Revelation 18:17
For in a single hour such fabulous wealth has been destroyed!" Every shipmaster, passenger, and sailor, and all who make their living from the sea, will stand at a distance

And the ten horns which you saw are ten kings, which have received no kingdom as yet; but receive power as kings one hour with the beast.