Are underscores allowed in domain names?

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Tags

1. #quote
2. #places
3. #itself
4. #particular
5. #domain
6. #restriction
7. #section
8. #underscores
9. #underscore
10. #labels
11. #identify
12. #legal
13. #records
14. #syntax
15. #domains
16. #common
17. #perfectly
18. #resource
19. #standard