What IP address should it be resolving to?

There is most definitely a problem with the DNS hosting currently.

Based on a whois lookup, nastyfans.org authoritative DNS servers are NS1/2/3/4.DOMAINS4BITCOINS.COM.

NS[1-4].DOMAINS4BITCOINS.COM are themselves not currently resolvable.

It appears that the DNS provider does not even have their own DNS currently working. If it is working for some people, I suspect that there is some caching going on somewhere. 99% of the world probably cannot resolve this domain right now and won't be able to until those nameservers come back online.