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by CoreDumpling 4816 days ago
Probably needs some adjustment or moderator intervention in the near term. I just tried a moment ago; you can still submit a pages.github.com URL and HN will mark the domain as github.com, but it will redirect to github.io when you follow the link.
1 comments

I really fail to see why HN doesn't display the subdomain in the submission. Is there a reason for this?
Because oftentimes the subdomain is irrelevant and would just make the display cluttered. More often than not the domain would be www.

We did the same thing on reddit for the same reason. A few domains get their subdomain when they are popular enough for people to complain.

No reason www. couldn't be stripped off.
Indeed, it's not like there are an endless number of common subdomains which don't convey much information. "www" is one, "blog" is another. That's about it.
The problem wasn't anticipated, and the fix has been to enable showing subdomains on only on certain domains, mainly blog hosts like wordpress, blogspot, tumblr.