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And what about ccTLDs. Can I buy Europian cctlds whereas im an asian?
I know of no restriction by nationality on buying domain names; why not try and come back to discuss any problem?
BTW using_under_scores.com is the very.worst.com possibleway.com of choosing-a-domain-name.com - remove all the .coms to make better sense of that comment ;)
VVV's quite right as regards country tlds - some countries will expect local hosting, a few will expect residence if not nationality - France beats Australia in being, I think, one of the toughest; UK probably the easiest!