As said, the domains with and without www will still redirect to www.unrealircd.org, but all the others have been removed.
It's easy to misconfigure something with all those domains (there were actually more than the 2 mentioned), resulting in fatal SSL errors and other problems. It's too much of a hassle considering that the domains shouldn't be used in the first place. All web pages, including the forums, bug tracker, etc, have been served using HTTPS at *.unrealircd.org for years now. This domain also has HSTS preload protection, something the other domains don't have.
In short: use *.unrealircd.org
