According to Revelation 12:9, the former archangel Lucifer and a third of the angels in heaven were thrown down to earth. The apostle Paul reveals that Lucifer now serves as the Ruler of the Air in Ephesus 2:2. While there is no direct mention of this, it is assumed that fallen angels now serve the Devil, aka Satan in the spiritual dimension, creating havoc for all human beings behind the scenes, Ephesians 6:12.
And angels who did not keep (care for, guard, and hold to) their own first place of power but abandoned their proper dwelling place—these He has reserved in custody in eternal chains (bonds) under the thick gloom of utter darkness until the judgment and doom of the great day. 7 [The wicked are sentenced to suffer] just as Sodom and Gomorrah and the adjacent towns—which likewise gave themselves over to impurity and indulged in unnatural vice and sensual perversity—are laid out [in plain sight] as an exhibit of perpetual punishment [to warn] of everlasting fire, Jude 1:6-7.
One section of the Bible known as the Catholic Letters, (universal letters to Christians scattered throughout the world following the persecution of Nero), provides a glimpse of what happened to fallen angels. Jude eludes to their eternal fate as followers of Lucifer. Comparing the judgment these angels will face to something worse than what occurred to Sodom and Gomorrah in the Old Testament.
For God did not [even] spare angels that sinned, but cast them into hell, delivering them to be kept there in pits of gloom till the judgment and their doom. 5 And He spared not the ancient world, but preserved Noah, a preacher of righteousness, with seven other persons, when He brought a flood upon the world of ungodly [people]. 6 And He condemned to ruin and extinction the cities of Sodom and Gomorrah, reducing them to ashes [and thus] set them forth as an example to those who would be ungodly; 2 Peter 2:4-6.
At some point prior to their expulsion, these angels abandoned their proper dwelling place. By exercising free will, these angels stopped caring for, guarding, holding on to and keeping the responsibilities assigned to them by their heavenly Father. When you examine the words of the Devil in Matthew 4:1-9, these once heavenly beings wanted recognition and praise. Subsequently, self gratification similar to the process illustrated in James 1:14-15 reveals what happened to these fallen angels.
by Jay Mankus