Huh, interesting. I didn't even know they'd allow you to do that. I assumed CF requires full DNS control to allow quickly switching over IP's in case of DOS and such.
HN does it via CNAMEs (this doesn't require manual editing of the IPs and CF can do it when they need to):
news.ycombinator.com. 76 IN CNAME news.ycombinator.com.cdn.cloudflare.net.
news.ycombinator.com.cdn.cloudflare.net. 124 IN A 198.41.191.47
news.ycombinator.com.cdn.cloudflare.net. 124 IN A 198.41.190.47
