HN has blocked in some area of China

As far as i know they will try to block dns, but not that ip from communicating with you.A simple way of accessing could be knowing its ip address by pinging that domain and using that ip address in browser.

Seems to be blocked right now: http://www.blockedinchina.net/?siteurl=news.ycombinator.com

It's not blocked in Shanghai. It's probably due to the ~10 underwater fiber optic lines outside Qingdao that got cut recently.