The tribe of Dan is not mentioned in Rev 7

Of the 12 sons of Jacob, Dan is not mentioned in Rev 7:

4 Then I heard the number of those who were sealed: 144,000 from all the tribes of Israel. 5 From the tribe of Judah 12,000 were sealed,
from the tribe of Reuben 12,000,
from the tribe of Gad 12,000,

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In place of Dan, we have Manasseh:

6 from the tribe of Asher 12,000,
from the tribe of Naphtali 12,000,
from the tribe of Manasseh 12,000

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Manasseh was a son of Joseph. In fact, Dan is not mentioned in the NT at all.

Why did John not mention Dan in Rev 7?

One possible reason could be found in Judges 18:

30 There the Danites set up for themselves the idol, and Jonathan son of Gershom, the son of Moses, and his sons were priests for the tribe of Dan until the time of the captivity of the land.

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As a tribe, the Danites were too much into idol worship.

On the other hand, Ezekiel prophesied in 48:

1“Now these are the names of the tribes:
At the northern frontier, Dan will have one portion bordering the road of Hethlon to Lebo-hamath and running on to Hazar-enan on the border of Damascus with Hamath to the north, and extending from the east side to the west side.
2 Asher will have one portion bordering the territory of Dan from east to west.

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In Ezekiel's vision of the new temple, there was land dedicated to the tribe of Dan.