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It's actually old.reddit.com but they probably have some sort of a wildcard rule.

This is probably it : any two letter combination seems to work.

Testing it out I found something interesting. You can put in subreddit.reddit.com and it redirects to reddit.com/r/subreddit. But any 2 char prefix works sends to old.reddit.com (a.reddit.com -> reddit.com/r/a)

e.g. hackernews.reddit.com -> reddit.com/r/hackernews

Why does this subreddit exist?

> hackernews.reddit.com -> reddit.com/r/hackernews

> Why does this subreddit exist?

Considering the prevalence of the rebuke "HN is not reddit" on HN, probably for people who want to talk in a more reddit-like style.

It was (originally) for localization: ja.reddit.com would (for example) give you a Japanese interface. Eventually they realized what a horrible idea l10n is for a community-oriented site, and dropped the translations, but kept the `lang` that it would apply attributes. Eventually subreddit moderators figured out that you could use this to provide multiple variants of the per-subreddit CSS, such as dark modes, custom filters, and other silliness[0].

[0]: For example, see /r/CrappyDesign with (https://old.reddit.com/r/CrappyDesign/) and without (https://of.reddit.com/r/CrappyDesign) Comic Sans.

Thanks!

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