I've verified my claim in the title via digwebinterface using every resolver.
Since it takes forever to load, here's a screenshot (1002x2394, 291KB): http://i.imgur.com/iqaGKt8.png
Text description: this screenshot shows every resolver that works (two couldn't be reached) saying SERVFAIL; the only one that still replies is OpenDNS, which returns an A record of 131.252.210.176. This uses a Location: redirect to send me to https://www.freedesktop.org/wiki/Software/fontconfig/.
Here are the settings I used - it takes a couple minutes to fully load, and DNS is usually fast, right? :S - http://www.digwebinterface.com/?hostnames=x.org&type=&showcommand=on&colorize=on&stats=on&sort=on&useresolver=8.8.4.4&ns=all&nameservers=
The domain seems to be registered until 2025, according to pir.org (754x882, 108KB): http://i.imgur.com/hsPqvaS.png (you have to go to https://pir.org/products/org-domain/#domain_form, input x.org and go past the captcha to reload this info)
I have no idea what's going on - I was looking up X11 documentation and thought it was my own internet when X.org persistently wasn't resolving.
All I know is that right now http://x.org, https://x.org, http://www.x.org and https://www.x.org don't seem to work.
I'm posting this in light of the recent Phoronix article outlining some ownership handover issues (https://news.ycombinator.com/item?id=10867202, https://www.phoronix.com/scan.php?page=news_item&px=X.Org-Domain-Woes). I'm not sure if this is related to that.
Once again if I've posted this due to misinterpretation or ignorance about networking then I apologize. (For example, I noticed that x.org uses two in-house nameservers, ns1.x.org and ns2.x.org, and perhaps those are down - but this would have had to have been for a while since 8.8.8.8 is answering SERVFAIL.)
[This has been crossposted to https://www.reddit.com/r/linux/comments/468c78/xorg_suddenly_isnt_resolving/.]