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We have a really old NIS domain which is mapping some user accounts to UIDs less than 1000. I'm wondering

  • when did using UIDs greater than or equal to 1000 for human users become 'standard',
  • why did it become a convention? Are there any practical implications or reasons for this? (i.e. anything similar like the 'convention' of trusting ports below 1000)
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According the UNIX and Linux System Administration Handbook (5th Edition) the idea behind starting UIDs at 1000 is to provide plenty of room for nonhuman users that might get added in the future.

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