None of the boards on 4chan will load.

When try to click on any of the boards from the main page, I get

Not Found

The requested URL /a/imgboard.html was not found on this server.

Any ideas? (/a/ is interchangeable with any board names)

check status.4chan.org
not every board is down

All of zip.4chan.org seems to be broken at the moment on my end as well. It's an isolated issue, since going by the front page, people are clearly still able to post.