However, compare text with text, a method that will never fail you - ask yourself where the devil and his angels wound up. I hardly need to give you a reference, as we all know this one: they were tossed into the Lake of Fire.
Now you know what was prepared for the devil and his angels - the Lake of Fire, mislabeled as "Hell." Now, wasn't that easy?
Your jumping the gun, they are not in the lake of fire yet.
The angels who sinned before the great judgement of the flood on the earth, God put them into gloomy dungeons, they are in chains and this means they can not be freed except by God's command. These are kept under the earth in hell, reserved to the final judgement of the last great Day of the Lord, then they will be cast into the lake of fire.
Jude
6 And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under darkness
unto the judgment of the great day. 7 Even as Sodom and Gomorrha, and the cities about them in like manner, giving themselves over to fornication, and going after strange flesh, are set forth for an example, suffering the vengeance of eternal fire.
2 Peter 2
3 And through covetousness shall they with feigned words make merchandise of you: whose judgment now of a long time lingereth not, and their damnation slumbereth not. 4 For if God spared not the angels that sinned, but cast
them down to hell, and delivered
them into chains of darkness,
to be reserved unto judgment; 5 and spared not the old world, but saved Noah the eighth
person, a preacher of righteousness, bringing in the flood upon the world of the ungodly; 6 and turning the cities of Sodom and Gomorrha into ashes condemned
them with an overthrow, making
them an ensample unto those that after should live ungodly; 7 and delivered just Lot, vexed with the filthy conversation of the wicked: 8 (for that righteous man dwelling among them, in seeing and hearing, vexed
his righteous soul from day to day with
their unlawful deeds
9 the Lord knoweth how to deliver the godly out of temptations, and to reserve the unjust unto the day of judgment to be punished: