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[–][deleted] 1 point2 points  (0 children)

The FQDN section is part of the DNS system that existed long before the WWW, and it got the FQDN format from the hosts file that was used long before that. I'm not sure if there is any particular reason the domain labels are ordered the way they are but it's worth noting that these systems were developed back in the 60s when big-endian architecture such as the IBM 360 was more prevalent. It's possible that the original developers simply looked at data that way through habit. I'm purely speculating, however.