Jesus was from Judah, Paul was from Benjamin, and John the Baptist was a Levite, but, since the diaspora in A.D. 70, identifying the tribe of a modern Jew is a little more difficult. That doesn’t mean that the tribal divisions are irrelevant. During the tribulation, when most of the world has abandoned God and is following the Antichrist, 144,000 Jews will be sealed by God. This number comprises 12,000 from each tribe. So, even if we don’t know who is in what tribe, God has kept track.
There is no mention of the tribe of Dan, and the Bible does not tell us why Dan should be omitted. There are some details of the history of the tribe of Dan that might help explain why Dan is missing from the list of sealed tribes in Revelation. Judges 18:1–31 tells the story of the people of Dan falling into gross idolatry. Also, the Danites did not like the territory allotted to them near the Mediterranean Sea—the Amorites and Philistines gave them trouble—so they sent out spies to find a better area. In the north, the Danites learned of an area inhabited by a peaceful group of people, whom the Danites proceeded to wipe out; they then moved the entire tribe up to that region, just south of present-day Lebanon. There they established their main city and called it Dan. Later, in the divided kingdom, the people of Dan were part of the northern kingdom of Israel. King Jeroboam I established two pagan worship centers, one in Bethel and one in Dan (1 Kings 12:25–33). Sadly, this man-made worship at Dan, centered on a golden calf, became one of Dan’s lasting legacies. Some of the reason that Dan is not listed in Revelation are, Dan’s historical embrace of idolatry and immorality leads to a disqualification for service during the end times.The Antichrist will come from the tribe of Dan (based on certain readings of Genesis 49:17; Deuteronomy 33:22; and Jeremiah 8:16). By the time of Solomon, the tribe of Dan had assimilated with the neighboring Phoenicians and so lost their national identity. The tribe of Dan, once the second-most populous tribe, declined in numbers and influence until, by Ezra’s time, it had been totally wiped out. This would explain why Dan is not listed among the tribes in in Revelation 7. To me the left out tribe of Dan shows us that God is in control and He will judge people for their sins.