Domain only responding to certain locations?

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http://serverfault.com – I have a client who's been having problems with hes site, the server doesn't seem to want to load hes site in certain countries, I mean other sites are fine. But this site (technologyhub.org) just seems to want to load only in the US and Canada locals, Europe, the UK, Asia etc, all seem to be blocked (been like this for a week now). Its strange I've checked over the server.. It seems fine. Other sites work fine, the NS are set up fine pointing to my main server http://puu.sh/MIGF Any ideas? (HowTos)